diff --git a/src/admin/layout/class-settings-page.php b/src/admin/layout/class-settings-page.php
index 7d9fec1..c3db793 100644
--- a/src/admin/layout/class-settings-page.php
+++ b/src/admin/layout/class-settings-page.php
@@ -21,7 +21,6 @@ require_once plugin_dir_path( dirname( __FILE__, 2 ) ) . 'includes/class-setting
 
 use footnotes\includes\{Template, Settings, Parser, Config, Convert};
 use footnotes\general\General;
-use const footnotes\settings\general\ReferenceContainerSettingsGroup\{COMBINE_IDENTICAL_FOOTNOTES};
 
 /**
  * Provides the abstract class to be extended for page layouts.
diff --git a/src/includes/class-settings.php b/src/includes/class-settings.php
index 7c7b1ea..a4ec9f7 100644
--- a/src/includes/class-settings.php
+++ b/src/includes/class-settings.php
@@ -15,13 +15,6 @@ namespace footnotes\includes;
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 
-/**
- * Provides data conversion methods.
- *
- * @todo Move to {@see Loader}.
- */
-require_once plugin_dir_path( __DIR__ ) . 'includes/class-convert.php';
-
 use footnotes\includes\settings\general\GeneralSettingsSection;
 use footnotes\includes\settings\referrersandtooltips\ReferrersAndTooltipsSettingsSection;
 use footnotes\includes\settings\scopeandpriority\ScopeAndPrioritySettingsSection;
@@ -62,10 +55,6 @@ class Settings {
 	 * @since  2.8.0
 	 */
 	public $settings_sections = array();
-	
-	/**********************************************************************
-	 *      SETTINGS STORAGE.
-	 **********************************************************************/
 
 	/**
 	 * Loads all Settings from each WordPress Settings Container.
@@ -88,6 +77,9 @@ class Settings {
 	 *
 	 * Includes the following files that make up the plugin:
 	 *
+	 * - {@see SettingsSection}: defines a section of settings groups;
+	 * - {@see SettingsGroup}: defines a group of settings;
+	 * - {@see Setting}: defines a single setting;
 	 * - {@see GeneralSettingsSection}: provides general plugin settings;
 	 * - {@see ReferrersAndTooltipsSettingsSection}: provides settings for
 	 *   customising the plugin's created referrers and tooltips;
@@ -100,6 +92,10 @@ class Settings {
 	 * @return void
 	 */
 	protected function load_dependencies(): void {
+    require_once plugin_dir_path( __DIR__ ) . 'includes/settings/class-settings-section.php';
+    require_once plugin_dir_path( __DIR__ ) . 'includes/settings/class-settings-group.php';
+    require_once plugin_dir_path( __DIR__ ) . 'includes/settings/class-setting.php';
+    
 		require_once plugin_dir_path( __DIR__ ) . 'includes/settings/general/class-general-settings-section.php';
 		require_once plugin_dir_path( __DIR__ ) . 'includes/settings/referrers-and-tooltips/class-referrers-and-tooltips-settings-section.php';
 		require_once plugin_dir_path( __DIR__ ) . 'includes/settings/scope-and-priority/class-scope-and-priority-settings-section.php';
@@ -148,7 +144,7 @@ class Settings {
 	}
 	
 	/**
-	 * Retrieve a setting's defaultvalue by its key.
+	 * Retrieve a setting's default value by its key.
 	 *
 	 * @param  string  $setting_key  The key of the setting to search for.
 	 * @return  mixed Either the setting's default value, or `null` if the setting does not exist.
@@ -167,6 +163,28 @@ class Settings {
 		
 		return null;
 	}
+	
+	/**
+	 * Set a setting's value by its key.
+	 *
+	 * @param  string  $setting_key  The key of the setting to search for.
+	 * @param  mixed  $setting_value  The new value to set.
+	 * @return  mixed  'True' if the value was successfully set. 'False' otherwise.
+	 *
+	 * @since  2.8.0
+	 *
+	 * @todo  This is an _O(n)_ linear search. Explore more scaleable alternatives.
+	 * @todo  How to handle settings with a value of `null`?
+	 */
+	public function set_setting_value( string $setting_key, mixed $setting_value ): ?bool {		
+		foreach ($this->settings_sections as $settings_section) {
+			$setting = $settings_section->get_setting($setting_key);
+			
+			if ($setting) return $setting->set_value( $setting_value );
+		}
+		
+		return false;
+	}
 
 	/**
 	 * Returns the name of a specified Settings Container.
diff --git a/src/includes/settings/class-setting.php b/src/includes/settings/class-setting.php
index 6781275..0fa08a6 100644
--- a/src/includes/settings/class-setting.php
+++ b/src/includes/settings/class-setting.php
@@ -76,6 +76,11 @@ class Setting {
 	 */
 	protected mixed $value;
 
+	/**
+	 * Constructs the setting.
+	 *
+	 * @since  2.8.0
+	 */
 	public function __construct(
 		/**
 		 * Setting group ID.
@@ -204,7 +209,8 @@ class Setting {
 		/**
 		 * The plugin settings object.
 		 *
-		 * @access  private
+		 * @var  Settings
+		 *
 		 * @since  2.8.0
 		 */
 		private Settings $settings
@@ -214,6 +220,15 @@ class Setting {
 		register_setting( $this->options_group_slug, $this->key, $this->get_setting_args());
 	}
 	
+	/**
+	 * Get the args for registering the settings with WordPress.
+	 *
+	 * @see register_setting()
+	 *
+	 * @return array The setting field args.
+	 *
+	 * @since 2.8.0
+	 */
 	public function get_setting_args(): array {
 		return array (
 			'type' => $this->type,
@@ -223,7 +238,13 @@ class Setting {
 	}
 	
 	/**
+	 * Get the args for rendering setting fields on the admin. dashboard.
 	 *
+	 * @see add_settings_field()
+	 *
+	 * @return array The setting field args.
+	 *
+	 * @since 2.8.0
 	 */
 	public function get_setting_field_args(): array {
 		return array (
@@ -239,6 +260,15 @@ class Setting {
 		);
 	}
 	
+	/**
+	 * Check whether a setting is enabled and/or overridden.
+	 *
+	 * @return ?bool 'True' if the setting is disabled or overridden.
+	 *               'False' if it could be, but isn't currently.
+	 *               'None' if the setting is not enabled/overridden by another.
+	 *
+	 * @since 2.8.0
+	 */
 	private function is_disabled_or_overridden(): ?bool {		
 		if (isset($this->enabled_by)) {
 		  $enabled_by_value = $this->settings->get_setting_value($this->enabled_by);
@@ -261,36 +291,68 @@ class Setting {
 		} else return null;
 	}
 	
+	/**
+	 * Gets the slug of the setting's options group.
+	 *
+	 * @return string The options group slug.
+	 *
+	 * @since 2.8.0
+	 */
 	public function get_options_group_slug(): string {
 		return $this->options_group_slug;
 	}
 	
+	/**
+	 * Gets the slug of the setting's section.
+	 *
+	 * @return string The section slug.
+	 *
+	 * @since 2.8.0
+	 */
 	public function get_section_slug(): string {
 		return $this->section_slug;
 	}
 	
 	/**
-	 * 
+	 * Gets the value of the setting.
+	 *
+	 * @return  mixed  The value of the setting, or the default value if none is set. 'None' if neither are set.
+	 *
+	 * @since 2.8.0
 	 */
 	public function get_value(): mixed {
 		return $this->value ?? $this->default_value ?? null;
 	}
 	
 	/**
-	 * 
+	 * Gets the default value of the setting.
+	 *
+	 * @return  mixed  The default value of the setting. 'None' if one is not set.
+	 *
+	 * @since 2.8.0
 	 */
 	public function get_default_value(): mixed {
 		return $this->default_value ?? null;
 	}
 	
 	/**
-	 * 
+	 * Gets the input options of the setting.
+	 *
+	 * @return  ?array  The possible options of the setting. 'None' if no options are set.
+	 *
+	 * @since 2.8.0
 	 */
 	public function get_input_options(): ?array {
 		return $this->input_options ?? null;
 	}
 	
 	/**
+	 * Sets the value of the setting.
+	 *
+	 * @param mixed $value The new value to set.
+	 * @return bool 'True' if the value was successfully set. 'False' otherwise.
+	 *
+	 * @since 2.8.0
 	 */
 	public function set_value(mixed $value): bool {
 		$this->value = $value;
diff --git a/src/includes/settings/class-settings-group.php b/src/includes/settings/class-settings-group.php
index b5c9a97..1d50b67 100644
--- a/src/includes/settings/class-settings-group.php
+++ b/src/includes/settings/class-settings-group.php
@@ -11,7 +11,7 @@ declare(strict_types=1);
 namespace footnotes\includes\settings;
 
 use footnotes\includes\Settings;
-use footnotes\admin\layout as Layout;
+use footnotes\admin\layout\SettingsPage;
 
 /**
  * Class defining a group of plugin settings within a section.
@@ -56,6 +56,11 @@ abstract class SettingsGroup {
 	 */
 	protected array $settings;
 	
+	/**
+	 * Constructs the settings section.
+	 *
+	 * @since  2.8.0
+	 */
 	public function __construct(
 		/**
 		 * Setting options group slug.
@@ -88,12 +93,38 @@ abstract class SettingsGroup {
 		$this->add_settings( get_option( $this->options_group_slug ) );
 	}
 	
+	/**
+	 * Load the required dependencies.
+	 *
+	 * Include the following files that provide the settings for this plugin:
+	 *
+	 * - {@see Setting}: defines individual settings.
+	 *
+	 * @since  2.8.0
+	 */
 	protected function load_dependencies(): void {
 		require_once plugin_dir_path( __DIR__ ) . 'settings/class-setting.php';
 	}
 	
+	/**
+	 * Add the settings for this settings group.
+	 *
+	 * @abstract
+	 * @param  array<string,mixed>|false  $options  Saved values for the settings in this group. 'False' if none exist.
+	 * @return  void
+	 *
+	 * @since  2.8.0
+	 */
 	protected abstract function add_settings(array|false $options): void;
 	
+	/**
+	 * Constructs settings from the provided details.
+	 *
+	 * @param  array<string,mixed>  $setting  The setting details.
+	 * @return  Setting  The constructed setting object.
+	 *
+	 * @since  2.8.0
+	 */
 	protected function add_setting(array $setting): Setting {
 		extract( $setting );
 		
@@ -116,17 +147,33 @@ abstract class SettingsGroup {
 		);
 	}
 	
+	/**
+	 * Load the values for this settings group.
+	 *
+	 * @param  array<string,mixed>|false  $options  Saved values for the settings in this group. 'False' if none exist.
+	 * @return  void
+	 *
+	 * @since  2.8.0
+   * @todo Remove settings from options group when not found.
+	 */
 	protected function load_values(array|false $options): void {
 	  if ( ! $options ) return;
 		
-		// TODO remove unfound settings from option
 		foreach ( $options as $setting_key => $setting_value ) {
 		  if ( array_key_exists( $setting_key, $this->settings ) )
 		    $this->settings[$setting_key]->set_value( $setting_value );
 	  }
 	}
 	
-	public function add_settings_fields(Layout\SettingsPage $component): void {	  
+	/**
+	 * Adds all the settings fields for this group to the admin. dashboard.
+	 *
+	 * @param  SettingsPage  $component  The admin. dashboard settings page.
+	 * @return  void
+	 *
+	 * @since  2.8.0
+	 */
+	public function add_settings_fields(SettingsPage $component): void {	  
 		foreach ($this->settings as $setting) {			
 			add_settings_field(
 				$setting->key, 
@@ -139,6 +186,9 @@ abstract class SettingsGroup {
 		}
 	}
 	
+	/**
+	 * @see Settings::get_setting()
+	 */
 	public function get_setting(string $setting_key): ?Setting {
 		foreach ($this->settings as $setting) {
 			if ($setting->key === $setting_key) return $setting;
@@ -146,7 +196,10 @@ abstract class SettingsGroup {
 		
 		return null;
 	}
-
+	
+	/**
+	 * @see SettingsSection::get_options()
+	 */
 	public function get_options(): array {
 		$options = array();
 		
@@ -157,6 +210,9 @@ abstract class SettingsGroup {
 		return $options;
 	}
 
+	/**
+	 * @see Settings::get_setting_value()
+	 */
 	public function get_setting_value(string $setting_key) {
 		$setting = $this->get_setting($setting_key);
 
@@ -164,6 +220,9 @@ abstract class SettingsGroup {
 		else return $setting->value ?? $setting->default_value;
 	}
 
+	/**
+	 * @see Settings::set_setting_value()
+	 */
 	public function set_setting_value(string $setting_key, $value): bool {
 		return $this->get_setting($setting_key)->set_value($value);
 	}
diff --git a/src/includes/settings/class-settings-section.php b/src/includes/settings/class-settings-section.php
index ca19228..03be3a4 100644
--- a/src/includes/settings/class-settings-section.php
+++ b/src/includes/settings/class-settings-section.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * File providing the (new) `SettingsSection` class.
+ * File providing the `SettingsSection` class.
  *
  * @package footnotes
  * @since 2.8.0
@@ -10,10 +10,13 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings;
 
+use footnotes\includes\settings\SettingsGroup;
 use footnotes\admin\layout as Layout;
 
 /**
- * Class defining plugin settings.
+ * Abstract class defining a section of plugin settings.
+ *
+ * @abstract
  *
  * @package footnotes
  * @since 2.8.0
@@ -55,6 +58,15 @@ abstract class SettingsSection {
 	 */
 	protected array $settings_groups;
 	
+	/**
+	 * Load the required dependencies.
+	 *
+	 * Include the following files that provide the settings for this section:
+	 *
+	 * - {@see Setting}: defines a setting.
+	 *
+	 * @since 2.8.0
+	 */
 	protected function load_dependencies(): void {
 		require_once plugin_dir_path( __DIR__ ) . 'settings/class-setting.php';
 	}
@@ -88,24 +100,57 @@ abstract class SettingsSection {
 		echo "<hr>";
 	}
 	
+	/**
+	 * Add the settings groups for this settings section.
+	 *
+	 * @abstract
+	 * @return  void
+	 *
+	 * @since  2.8.0
+	 */
 	protected abstract function add_settings_groups(): void;
 	
 	public function get_options_group_slug(): string {
 		return $this->options_group_slug;
 	}
 	
+	/**
+	 * Gets the settings section slug.
+	 *
+	 * @return string The section slug.
+	 *
+	 * @since 2.8.0
+	 */
 	public function get_section_slug(): string {
 		return $this->section_slug;
 	}
 	
+	/**
+	 * Gets the settings section title.
+	 *
+	 * @return string The section title.
+	 *
+	 * @since 2.8.0
+	 */
 	public function get_title(): string {
 		return $this->title;
 	}
 	
-	public function get_settings_group(string $group_id) {
-		return $this->settings_groups[$group_id];
+	/**
+	 * Gets a settings groups from this section by its ID.
+	 *
+	 * @param string group_id The ID of the settings group.
+	 * @return ?SettingsGroup The section group. 'None' if none found.
+	 *
+	 * @since 2.8.0
+	 */
+	public function get_settings_group(string $group_id): ?SettingsGroup {
+		return $this->settings_groups[$group_id] ?? null;
 	}
 	
+	/**
+	 * @see Settings::get_setting()
+	 */
 	public function get_setting(string $setting_key): ?Setting {
 		foreach ($this->settings_groups as $settings_group) {
 			$setting = $settings_group->get_setting($setting_key);
@@ -116,6 +161,13 @@ abstract class SettingsSection {
 		return null;
 	}
 	
+	/**
+	 * Creates an options group from the values of the settings in this section.
+	 *
+	 * @return array The options group.
+	 *
+	 * @since 2.8.0
+	 */
 	public function get_options(): array {
 		$options = array();
 		
@@ -126,6 +178,9 @@ abstract class SettingsSection {
 		return $options;
 	}
 
+	/**
+	 * @see Settings::get_setting_value()
+	 */
 	public function get_setting_value(string $setting_key) {
 		$setting = $this->get_setting($setting_key);
 
@@ -133,6 +188,9 @@ abstract class SettingsSection {
 		else return $setting->value ?? $setting->default_value ?? trigger_error("No default value found for ".$setting_key.".", E_USER_ERROR);
 	}
 
+	/**
+	 * @see Settings::set_setting_value()
+	 */
 	public function set_setting_value(string $setting_key, $value): ?bool {
 		$setting = $this->get_setting($setting_key);
 		
diff --git a/src/includes/settings/custom-css/class-custom-css-settings-group.php b/src/includes/settings/custom-css/class-custom-css-settings-group.php
index 06e9b4b..db44342 100644
--- a/src/includes/settings/custom-css/class-custom-css-settings-group.php
+++ b/src/includes/settings/custom-css/class-custom-css-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\customcss;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -30,7 +28,16 @@ class CustomCSSSettingsGroup extends SettingsGroup {
 	 *
 	 * @since  2.8.0
 	 */
-	const GROUP_ID = 'custom-css';
+	public const GROUP_ID = 'custom-css';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'Custom CSS';
 
 	/**
 	 * Settings container key for the Custom CSS.
@@ -41,13 +48,31 @@ class CustomCSSSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0  Move from `Settings` to `ReferenceContainerSettingsGroup`.
 	 *                Convert from `string` to `array`.
 	 */
-	const CUSTOM_CSS = array(
+	public const CUSTOM_CSS = array(
 		'key'           => 'footnote_inputfield_custom_css_new',
 		'name'          => 'Your Existing Custom CSS Code',
 		'type'          => 'string',
 		'input_type'    => 'textarea',
 	);
-		
+	
+	/**
+	 * Load the required dependencies.
+	 *
+	 * Include the following files that provide the settings for this plugin:
+	 *
+	 * - {@see SettingsGroup}: defines a group of settings.
+	 *
+	 * @see SettingsGroup::load_dependencies()
+	 */
+	protected function load_dependencies(): void {
+	  parent::load_dependencies();
+	  
+    require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
+	}
+	
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::CUSTOM_CSS['key'] => $this->add_setting( self::CUSTOM_CSS ),
diff --git a/src/includes/settings/custom-css/class-custom-css-settings-section.php b/src/includes/settings/custom-css/class-custom-css-settings-section.php
index 6325798..347a023 100644
--- a/src/includes/settings/custom-css/class-custom-css-settings-section.php
+++ b/src/includes/settings/custom-css/class-custom-css-settings-section.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\customcss;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-section.php';
-
 use footnotes\includes\Settings;
 
 use footnotes\includes\settings\SettingsSection;
@@ -34,6 +32,15 @@ class CustomCSSSettingsSection extends SettingsSection {
 	 */
 	protected array $settings_groups;
 	
+	/**
+	 * Constructs the settings section.
+	 *
+	 * @param string options_group_slug The slug of the settings section's options group.
+	 * @param string section_slug The slug of the settings section.
+	 * @param string title The name of the settings section.
+	 *
+	 * @since  2.8.0
+	 */
 	public function __construct(
 		$options_group_slug,
 		$section_slug,
@@ -57,13 +64,28 @@ class CustomCSSSettingsSection extends SettingsSection {
 
 		$this->load_options_group();
 	}
-	
+
+	/**
+	 * Load the required dependencies.
+	 *
+	 * Include the following files that provide the settings for this section:
+	 *
+	 * - {@see SettingsSection}: defines a settings section; and
+	 * - {@see CustomCSSSettingsGroup}.
+	 *
+	 * @see SettingsSection::load_dependencies()
+	 */
 	protected function load_dependencies(): void {
 	  parent::load_dependencies();
+
+    require_once plugin_dir_path( __DIR__ ) . 'class-settings-section.php';
 	  
 		require_once plugin_dir_path( __DIR__ ) . 'custom-css/class-custom-css-settings-group.php';
 	}
 	
+	/**
+	 * @see SettingsSection::add_settings_groups()
+	 */
 	protected function add_settings_groups(): void {
 		$this->settings_groups = array (
 			CustomCSSSettingsGroup::GROUP_ID => new CustomCSSSettingsGroup($this->options_group_slug, $this->section_slug, $this->settings ),
diff --git a/src/includes/settings/general/class-amp-compat-settings-group.php b/src/includes/settings/general/class-amp-compat-settings-group.php
index 766e8c5..142ffde 100644
--- a/src/includes/settings/general/class-amp-compat-settings-group.php
+++ b/src/includes/settings/general/class-amp-compat-settings-group.php
@@ -11,8 +11,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\general;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Footnotes;
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
@@ -42,7 +40,7 @@ class AMPCompatSettingsGroup extends SettingsGroup {
 	 *
 	 * @since  2.8.0
 	 */
-	const GROUP_NAME = 'AMP Compatiblility (unsupported)';
+	const GROUP_NAME = 'AMP Compatiblility (deprecated)';
 
 	/**
 	 * Settings container key to enable AMP compatibility mode.
@@ -63,6 +61,9 @@ class AMPCompatSettingsGroup extends SettingsGroup {
 		'input_type'    => 'checkbox',
 	);
 	
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::FOOTNOTES_AMP_COMPATIBILITY_ENABLE['key'] => $this->add_setting( self::FOOTNOTES_AMP_COMPATIBILITY_ENABLE ),
diff --git a/src/includes/settings/general/class-excerpts-settings-group.php b/src/includes/settings/general/class-excerpts-settings-group.php
index 62668d5..a908d64 100644
--- a/src/includes/settings/general/class-excerpts-settings-group.php
+++ b/src/includes/settings/general/class-excerpts-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\general;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Footnotes;
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
@@ -64,7 +62,10 @@ class ExcerptsSettingsGroup extends SettingsGroup {
 			'manual' => 'Yes but run the process only to display tooltips in manual excerpts with footnote short codes'
 		),
 	);
-
+	
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::FOOTNOTES_IN_EXCERPT['key'] => $this->add_setting( self::FOOTNOTES_IN_EXCERPT ),
diff --git a/src/includes/settings/general/class-general-settings-section.php b/src/includes/settings/general/class-general-settings-section.php
index 12775c5..6a6f346 100644
--- a/src/includes/settings/general/class-general-settings-section.php
+++ b/src/includes/settings/general/class-general-settings-section.php
@@ -10,10 +10,7 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\general;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-section.php';
-
 use footnotes\includes\Settings;
-
 use footnotes\includes\settings\SettingsSection;
 
 use footnotes\includes\settings\general\ReferenceContainerSettingsGroup;
@@ -41,6 +38,15 @@ class GeneralSettingsSection extends SettingsSection {
 	 */
 	protected array $settings_groups;
 
+	/**
+	 * Constructs the settings section.
+	 *
+	 * @param string options_group_slug The slug of the settings section's options group.
+	 * @param string section_slug The slug of the settings section.
+	 * @param string title The name of the settings section.
+	 *
+	 * @since  2.8.0
+	 */
 	public function __construct(
 		$options_group_slug,
 		$section_slug,
@@ -65,6 +71,23 @@ class GeneralSettingsSection extends SettingsSection {
 		$this->load_options_group();
 	}
 
+	/**
+	 * Load the required dependencies.
+	 *
+	 * Include the following files that provide the settings for this section:
+	 *
+	 * - {@see SettingsSection}: defines a settings section;
+	 * - {@see AMPCompatSettingsGroup};
+	 * - {@see ReferenceContainerSettingsGroup};
+	 * - {@see ScrollingSettingsGroup};
+	 * - {@see ShortcodeSettingsGroup};
+	 * - {@see NumberingSettingsGroup};
+	 * - {@see HardLinksSettingsGroup};
+	 * - {@see ExcerptsSettingsGroup}; and
+	 * - {@see LoveSettingsGroup}.
+	 *
+	 * @see SettingsSection::load_dependencies()
+	 */
 	protected function load_dependencies(): void {
 		parent::load_dependencies();
 
@@ -77,7 +100,10 @@ class GeneralSettingsSection extends SettingsSection {
 		require_once plugin_dir_path( __DIR__ ) . 'general/class-excerpts-settings-group.php';
 		require_once plugin_dir_path( __DIR__ ) . 'general/class-amp-compat-settings-group.php';
 	}
-
+	
+	/**
+	 * @see SettingsSection::add_settings_groups()
+	 */
 	protected function add_settings_groups(): void {
 		$this->settings_groups = array(
 			AMPCompatSettingsGroup::GROUP_ID          => new AMPCompatSettingsGroup( $this->options_group_slug, $this->section_slug, $this->settings ),
diff --git a/src/includes/settings/general/class-hard-links-settings-group.php b/src/includes/settings/general/class-hard-links-settings-group.php
index a62f3e2..de20c77 100644
--- a/src/includes/settings/general/class-hard-links-settings-group.php
+++ b/src/includes/settings/general/class-hard-links-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\general;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -31,6 +29,15 @@ class HardLinksSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0
 	 */
 	const GROUP_ID = 'hard-links';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'URL Fragment ID Configuration';
 
 	/**
 	 * Settings container key to enable hard links.
@@ -150,7 +157,10 @@ class HardLinksSettingsGroup extends SettingsGroup {
 		'type'          => 'string',
 		'input_type'    => 'text',
 	);
-
+	
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::FOOTNOTES_HARD_LINKS_ENABLE['key'] => $this->add_setting( self::FOOTNOTES_HARD_LINKS_ENABLE ),
diff --git a/src/includes/settings/general/class-love-settings-group.php b/src/includes/settings/general/class-love-settings-group.php
index 9a1a067..9aee495 100644
--- a/src/includes/settings/general/class-love-settings-group.php
+++ b/src/includes/settings/general/class-love-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\general;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Footnotes;
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
@@ -24,7 +22,22 @@ use footnotes\includes\settings\SettingsGroup;
  * @since 2.8.0
  */
 class LoveSettingsGroup extends SettingsGroup {
+	/**
+	 * The HTML 'love' symbol.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
 	const LOVE_SYMBOL = '<span style="color:#ff6d3b; font-weight:bold;">&hearts;</span>';
+	
+	/**
+	 * The HTML Plugin logogram.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
 	const PLUGIN_SYMBOL = '<span class="footnotes_logo footnotes_logo_part1">foot</span><span class="footnotes_logo footnotes_logo_part2">notes</span>';
 	
 	/**
@@ -43,7 +56,7 @@ class LoveSettingsGroup extends SettingsGroup {
 	 *
 	 * @since  2.8.0
 	 */
-	const GROUP_NAME = self::LOVE_SYMBOL . ' Love';
+	const GROUP_NAME = self::PLUGIN_SYMBOL . ' ' . self::LOVE_SYMBOL;
 
 	/**
 	 * Settings container key for the ‘I love footnotes’ text.
@@ -99,7 +112,10 @@ class LoveSettingsGroup extends SettingsGroup {
 		'type'          => 'string',
 		'input_type'    => 'text',
 	);
-
+	
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::FOOTNOTES_LOVE['key'] => $this->add_setting( self::FOOTNOTES_LOVE ),
diff --git a/src/includes/settings/general/class-numbering-settings-group.php b/src/includes/settings/general/class-numbering-settings-group.php
index 4c43922..714ac63 100644
--- a/src/includes/settings/general/class-numbering-settings-group.php
+++ b/src/includes/settings/general/class-numbering-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\general;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -31,6 +29,15 @@ class NumberingSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0
 	 */
 	const GROUP_ID = 'numbering';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'Footnotes Numbering';
 
 	/**
 	 * Settings container key for combining identical footnotes.
@@ -78,7 +85,10 @@ class NumberingSettingsGroup extends SettingsGroup {
 			'roman_low'      => 'lowercase Roman numerals (i, ii, iii, iv, v, &hellip;)',
 		),
 	);
-
+	
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::COMBINE_IDENTICAL_FOOTNOTES['key'] => $this->add_setting( self::COMBINE_IDENTICAL_FOOTNOTES ),
diff --git a/src/includes/settings/general/class-reference-container-settings-group.php b/src/includes/settings/general/class-reference-container-settings-group.php
index 0c8b827..0ee04c4 100644
--- a/src/includes/settings/general/class-reference-container-settings-group.php
+++ b/src/includes/settings/general/class-reference-container-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\general;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -31,6 +29,15 @@ class ReferenceContainerSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0
 	 */
 	const GROUP_ID = 'reference-container';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'Reference Container';
 
 	/**
 	 * Settings container key for the label of the reference container.
@@ -680,7 +687,10 @@ class ReferenceContainerSettingsGroup extends SettingsGroup {
 		'type'          => 'boolean',
 		'input_type'    => 'checkbox',
 	);
-
+	
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::REFERENCE_CONTAINER_NAME['key']          => $this->add_setting( self::REFERENCE_CONTAINER_NAME ),
diff --git a/src/includes/settings/general/class-scrolling-settings-group.php b/src/includes/settings/general/class-scrolling-settings-group.php
index 87a0fa9..b39d2c0 100644
--- a/src/includes/settings/general/class-scrolling-settings-group.php
+++ b/src/includes/settings/general/class-scrolling-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\general;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -31,6 +29,15 @@ class ScrollingSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0
 	 */
 	const GROUP_ID = 'scrolling';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'Scrolling Behavior';
 
 	/**
 	 * Settings container key to enable CSS smooth scrolling.
@@ -172,7 +179,10 @@ class ScrollingSettingsGroup extends SettingsGroup {
 		'input_min'     => 0,
 		'enabled_by'    => self::FOOTNOTES_SCROLL_DURATION_ASYMMETRICITY,
 	);
-
+	
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::FOOTNOTES_CSS_SMOOTH_SCROLLING['key'] => $this->add_setting( self::FOOTNOTES_CSS_SMOOTH_SCROLLING ),
diff --git a/src/includes/settings/general/class-shortcode-settings-group.php b/src/includes/settings/general/class-shortcode-settings-group.php
index 345a998..111d157 100644
--- a/src/includes/settings/general/class-shortcode-settings-group.php
+++ b/src/includes/settings/general/class-shortcode-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\general;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -31,6 +29,15 @@ class ShortcodeSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0
 	 */
 	const GROUP_ID = 'shortcode';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'Footnote Start and End Short Codes';
 
 	/**
 	 * Settings container key to enable shortcode syntax validation.
@@ -141,7 +148,10 @@ class ShortcodeSettingsGroup extends SettingsGroup {
 		'input_type' => 'text',
 		'enabled_by' => self::FOOTNOTES_SHORT_CODE_END,
 	);
-
+	
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::FOOTNOTE_SHORTCODE_SYNTAX_VALIDATION_ENABLE['key'] => $this->add_setting( self::FOOTNOTE_SHORTCODE_SYNTAX_VALIDATION_ENABLE ),
diff --git a/src/includes/settings/referrers-and-tooltips/class-backlink-symbol-settings-group.php b/src/includes/settings/referrers-and-tooltips/class-backlink-symbol-settings-group.php
index 78393b2..46e6624 100644
--- a/src/includes/settings/referrers-and-tooltips/class-backlink-symbol-settings-group.php
+++ b/src/includes/settings/referrers-and-tooltips/class-backlink-symbol-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\referrersandtooltips;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -31,6 +29,15 @@ class BacklinkSymbolSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0
 	 */
 	const GROUP_ID = 'backlink-symbol';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'Backlink Symbol';
 
 	/**
 	 * Settings container key for the backlink symbol selection.
@@ -80,7 +87,10 @@ class BacklinkSymbolSettingsGroup extends SettingsGroup {
 		'type'          => 'string',
 		'input_type'    => 'text',
 	);
-
+		
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::HYPERLINK_ARROW['key'] => $this->add_setting( self::HYPERLINK_ARROW ),
diff --git a/src/includes/settings/referrers-and-tooltips/class-referrers-and-tooltips-settings-section.php b/src/includes/settings/referrers-and-tooltips/class-referrers-and-tooltips-settings-section.php
index 398ef29..894687d 100644
--- a/src/includes/settings/referrers-and-tooltips/class-referrers-and-tooltips-settings-section.php
+++ b/src/includes/settings/referrers-and-tooltips/class-referrers-and-tooltips-settings-section.php
@@ -10,10 +10,7 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\referrersandtooltips;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-section.php';
-
 use footnotes\includes\Settings;
-
 use footnotes\includes\settings\SettingsSection;
 
 /**
@@ -32,6 +29,15 @@ class ReferrersAndTooltipsSettingsSection extends SettingsSection {
 	 */
 	protected array $settings_groups;
 	
+	/**
+	 * Constructs the settings section.
+	 *
+	 * @param string options_group_slug The slug of the settings section's options group.
+	 * @param string section_slug The slug of the settings section.
+	 * @param string title The name of the settings section.
+	 *
+	 * @since  2.8.0
+	 */
 	public function __construct(
 		$options_group_slug,
 		$section_slug,
@@ -56,6 +62,25 @@ class ReferrersAndTooltipsSettingsSection extends SettingsSection {
 		$this->load_options_group();
 	}
 	
+	/**
+	 * Load the required dependencies.
+	 *
+	 * Include the following files that provide the settings for this section:
+	 *
+	 * - {@see SettingsSection}: defines a section of settings;
+	 * - {@see BacklinkSymbolSettingsGroup};
+	 * - {@see ReferrersSettingsGroup};
+	 * - {@see ReferrersInLabelsSettingsGroup};
+	 * - {@see TooltipsSettingsGroup};
+	 * - {@see TooltipAppearanceSettingsGroup};
+	 * - {@see TooltipDimensionsSettingsGroup};
+	 * - {@see TooltipPositionSettingsGroup};
+	 * - {@see TooltipTextSettingsGroup};
+	 * - {@see TooltipTimingSettingsGroup}; and
+	 * - {@see TooltipTruncationSettingsGroup}.
+	 *
+	 * @see SettingsSection::load_dependencies()
+	 */
 	protected function load_dependencies(): void {
 	  parent::load_dependencies();
 	  
@@ -71,6 +96,9 @@ class ReferrersAndTooltipsSettingsSection extends SettingsSection {
 		require_once plugin_dir_path( __DIR__ ) . 'referrers-and-tooltips/class-tooltip-truncation-settings-group.php';
 	}
 	
+	/**
+	 * @see SettingsSection::add_settings_groups()
+	 */
 	protected function add_settings_groups(): void {
 		$this->settings_groups = array (
 			BacklinkSymbolSettingsGroup::GROUP_ID => new BacklinkSymbolSettingsGroup( $this->options_group_slug, $this->section_slug, $this->settings ),
diff --git a/src/includes/settings/referrers-and-tooltips/class-referrers-in-labels-settings-group.php b/src/includes/settings/referrers-and-tooltips/class-referrers-in-labels-settings-group.php
index 2263ec1..35fc504 100644
--- a/src/includes/settings/referrers-and-tooltips/class-referrers-in-labels-settings-group.php
+++ b/src/includes/settings/referrers-and-tooltips/class-referrers-in-labels-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\referrersandtooltips;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -31,6 +29,15 @@ class ReferrersInLabelsSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0
 	 */
 	const GROUP_ID = 'referrers-in-label';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'Referrers in Labels';
 
 	/**
 	 * Settings container key to set the solution of the input element label issue.
@@ -62,7 +69,10 @@ class ReferrersInLabelsSettingsGroup extends SettingsGroup {
 		  'disconnect' =>  'B. Labels with footnotes are disconnected from input element (discouraged)'
 		),
 	);
-		
+	
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::FOOTNOTES_LABEL_ISSUE_SOLUTION['key'] => $this->add_setting( self::FOOTNOTES_LABEL_ISSUE_SOLUTION ),
diff --git a/src/includes/settings/referrers-and-tooltips/class-referrers-settings-group.php b/src/includes/settings/referrers-and-tooltips/class-referrers-settings-group.php
index 3db9c2a..cc09780 100644
--- a/src/includes/settings/referrers-and-tooltips/class-referrers-settings-group.php
+++ b/src/includes/settings/referrers-and-tooltips/class-referrers-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\referrersandtooltips;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -31,6 +29,15 @@ class ReferrersSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0
 	 */
 	const GROUP_ID = 'referrers';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'Referrers';
 
 	/**
 	 * Settings container key for the referrer element.
@@ -131,6 +138,9 @@ class ReferrersSettingsGroup extends SettingsGroup {
 		'input_type'    => 'checkbox',
 	);
 	
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::FOOTNOTES_REFERRER_SUPERSCRIPT_TAGS['key'] => $this->add_setting( self::FOOTNOTES_REFERRER_SUPERSCRIPT_TAGS ),
diff --git a/src/includes/settings/referrers-and-tooltips/class-tooltip-appearance-settings-group.php b/src/includes/settings/referrers-and-tooltips/class-tooltip-appearance-settings-group.php
index 67ddbf8..a39ef01 100644
--- a/src/includes/settings/referrers-and-tooltips/class-tooltip-appearance-settings-group.php
+++ b/src/includes/settings/referrers-and-tooltips/class-tooltip-appearance-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\referrersandtooltips;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -31,6 +29,15 @@ class TooltipAppearanceSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0
 	 */
 	const GROUP_ID = 'tooltip-appearance';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'Tooltip Appearance';
 
 	/**
 	 * Settings container key to enable setting the tooltip font size.
@@ -209,7 +216,10 @@ class TooltipAppearanceSettingsGroup extends SettingsGroup {
 		'type'          => 'string',
 		'input_type'    => 'color',
 	);
-	
+		
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::MOUSE_OVER_BOX_FONT_SIZE_ENABLED['key'] => $this->add_setting( self::MOUSE_OVER_BOX_FONT_SIZE_ENABLED ),
diff --git a/src/includes/settings/referrers-and-tooltips/class-tooltip-dimensions-settings-group.php b/src/includes/settings/referrers-and-tooltips/class-tooltip-dimensions-settings-group.php
index f3c9101..130f257 100644
--- a/src/includes/settings/referrers-and-tooltips/class-tooltip-dimensions-settings-group.php
+++ b/src/includes/settings/referrers-and-tooltips/class-tooltip-dimensions-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\referrersandtooltips;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -31,6 +29,15 @@ class TooltipDimensionsSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0
 	 */
 	const GROUP_ID = 'tooltip-dimensions';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'Tooltip Dimensions';
 
 	/**
 	 * Settings container key for the mouse-over box to define the max. width.
@@ -70,6 +77,9 @@ class TooltipDimensionsSettingsGroup extends SettingsGroup {
 		'input_type'    => 'number',
 	);
 		
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::FOOTNOTES_MOUSE_OVER_BOX_MAX_WIDTH['key'] => $this->add_setting( self::FOOTNOTES_MOUSE_OVER_BOX_MAX_WIDTH ),
diff --git a/src/includes/settings/referrers-and-tooltips/class-tooltip-position-settings-group.php b/src/includes/settings/referrers-and-tooltips/class-tooltip-position-settings-group.php
index 69aca0c..2d9b72c 100644
--- a/src/includes/settings/referrers-and-tooltips/class-tooltip-position-settings-group.php
+++ b/src/includes/settings/referrers-and-tooltips/class-tooltip-position-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\referrersandtooltips;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -31,6 +29,15 @@ class TooltipPositionSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0
 	 */
 	const GROUP_ID = 'tooltip-position';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'Tooltip Position';
 
 	/**
 	 * Settings container key for the mouse-over box to define the position.
@@ -164,6 +171,9 @@ class TooltipPositionSettingsGroup extends SettingsGroup {
 		'input_type'    => 'number',
 	);
 		
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::FOOTNOTES_MOUSE_OVER_BOX_POSITION['key'] => $this->add_setting( self::FOOTNOTES_MOUSE_OVER_BOX_POSITION ),
diff --git a/src/includes/settings/referrers-and-tooltips/class-tooltip-text-settings-group.php b/src/includes/settings/referrers-and-tooltips/class-tooltip-text-settings-group.php
index 6401bb6..788a19a 100644
--- a/src/includes/settings/referrers-and-tooltips/class-tooltip-text-settings-group.php
+++ b/src/includes/settings/referrers-and-tooltips/class-tooltip-text-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\referrersandtooltips;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -31,6 +29,15 @@ class TooltipTextSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0
 	 */
 	const GROUP_ID = 'tooltip-text';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'Tooltip Text';
 
 	/**
 	 * Settings container key to configure the tooltip excerpt delimiter.
@@ -103,6 +110,9 @@ class TooltipTextSettingsGroup extends SettingsGroup {
 		'input_type'    => 'text',
 	);
 		
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::FOOTNOTES_TOOLTIP_EXCERPT_DELIMITER['key'] => $this->add_setting( self::FOOTNOTES_TOOLTIP_EXCERPT_DELIMITER ),
diff --git a/src/includes/settings/referrers-and-tooltips/class-tooltip-timing-settings-group.php b/src/includes/settings/referrers-and-tooltips/class-tooltip-timing-settings-group.php
index 6e7de20..e7709fe 100644
--- a/src/includes/settings/referrers-and-tooltips/class-tooltip-timing-settings-group.php
+++ b/src/includes/settings/referrers-and-tooltips/class-tooltip-timing-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\referrersandtooltips;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -31,6 +29,15 @@ class TooltipTimingSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0
 	 */
 	const GROUP_ID = 'tooltip-timing';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'Tooltip Timing';
 
 	/**
 	 * Settings container key for tooltip display fade-in delay.
@@ -112,6 +119,9 @@ class TooltipTimingSettingsGroup extends SettingsGroup {
 		'input_min'     => 0,
 	);
 		
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::MOUSE_OVER_BOX_FADE_IN_DELAY['key'] => $this->add_setting( self::MOUSE_OVER_BOX_FADE_IN_DELAY ),
diff --git a/src/includes/settings/referrers-and-tooltips/class-tooltip-truncation-settings-group.php b/src/includes/settings/referrers-and-tooltips/class-tooltip-truncation-settings-group.php
index 442fa34..bd59873 100644
--- a/src/includes/settings/referrers-and-tooltips/class-tooltip-truncation-settings-group.php
+++ b/src/includes/settings/referrers-and-tooltips/class-tooltip-truncation-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\referrersandtooltips;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -31,6 +29,15 @@ class TooltipTruncationSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0
 	 */
 	const GROUP_ID = 'tooltip-truncation';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'Tooltip Truncation';
 
 	/**
 	 * Settings container key to enable tooltip truncation.
@@ -93,6 +100,9 @@ class TooltipTruncationSettingsGroup extends SettingsGroup {
 		'input_type'    => 'text',
 	);
 		
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::FOOTNOTES_MOUSE_OVER_BOX_EXCERPT_ENABLED['key'] => $this->add_setting( self::FOOTNOTES_MOUSE_OVER_BOX_EXCERPT_ENABLED ),
diff --git a/src/includes/settings/referrers-and-tooltips/class-tooltips-settings-group.php b/src/includes/settings/referrers-and-tooltips/class-tooltips-settings-group.php
index c58b20b..0dac43c 100644
--- a/src/includes/settings/referrers-and-tooltips/class-tooltips-settings-group.php
+++ b/src/includes/settings/referrers-and-tooltips/class-tooltips-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\referrersandtooltips;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -31,6 +29,15 @@ class TooltipsSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0
 	 */
 	const GROUP_ID = 'tooltips';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'Tooltips';
 
 	/**
 	 * Settings container key to enable the mouse-over box.
@@ -75,6 +82,9 @@ class TooltipsSettingsGroup extends SettingsGroup {
 		'input_type'    => 'checkbox',
 	);
 		
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::FOOTNOTES_MOUSE_OVER_BOX_ENABLED['key'] => $this->add_setting( self::FOOTNOTES_MOUSE_OVER_BOX_ENABLED ),
diff --git a/src/includes/settings/scope-and-priority/class-scope-and-priority-settings-section.php b/src/includes/settings/scope-and-priority/class-scope-and-priority-settings-section.php
index 788dd03..bb08222 100644
--- a/src/includes/settings/scope-and-priority/class-scope-and-priority-settings-section.php
+++ b/src/includes/settings/scope-and-priority/class-scope-and-priority-settings-section.php
@@ -10,10 +10,7 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\scopeandpriority;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-section.php';
-
 use footnotes\includes\Settings;
-
 use footnotes\includes\settings\SettingsSection;
 
 use footnotes\includes\settings\scopeandpriority\WordPressHooksSettingsGroup;
@@ -34,6 +31,15 @@ class ScopeAndPrioritySettingsSection extends SettingsSection {
 	 */
 	protected array $settings_groups;
 	
+	/**
+	 * Constructs the settings section.
+	 *
+	 * @param string options_group_slug The slug of the settings section's options group.
+	 * @param string section_slug The slug of the settings section.
+	 * @param string title The name of the settings section.
+	 *
+	 * @since  2.8.0
+	 */
 	public function __construct(
 		$options_group_slug,
 		$section_slug,
@@ -58,12 +64,25 @@ class ScopeAndPrioritySettingsSection extends SettingsSection {
 		$this->load_options_group();
 	}
 	
+	/**
+	 * Load the required dependencies.
+	 *
+	 * Include the following files that provide the settings for this section:
+	 *
+	 * - {@see SettingsSection}: defines a settings section; and
+	 * - {@see WordPressHooksSettingsGroup}.
+	 *
+	 * @see SettingsSection::load_dependencies()
+	 */
 	protected function load_dependencies(): void {
 	  parent::load_dependencies();
-	  
+    
 		require_once plugin_dir_path( __DIR__ ) . 'scope-and-priority/class-wordpress-hooks-settings-group.php';
 	}
 	
+	/**
+	 * @see SettingsSection::add_settings_groups()
+	 */
 	protected function add_settings_groups(): void {
 		$this->settings_groups = array (
 			WordPressHooksSettingsGroup::GROUP_ID => new WordPressHooksSettingsGroup($this->options_group_slug, $this->section_slug, $this->settings ),
diff --git a/src/includes/settings/scope-and-priority/class-wordpress-hooks-settings-group.php b/src/includes/settings/scope-and-priority/class-wordpress-hooks-settings-group.php
index 51360a7..76b09f7 100644
--- a/src/includes/settings/scope-and-priority/class-wordpress-hooks-settings-group.php
+++ b/src/includes/settings/scope-and-priority/class-wordpress-hooks-settings-group.php
@@ -10,8 +10,6 @@ declare(strict_types=1);
 
 namespace footnotes\includes\settings\scopeandpriority;
 
-require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
-
 use footnotes\includes\Settings;
 use footnotes\includes\settings\Setting;
 use footnotes\includes\settings\SettingsGroup;
@@ -30,7 +28,16 @@ class WordPressHooksSettingsGroup extends SettingsGroup {
 	 *
 	 * @since  2.8.0
 	 */
-	const GROUP_ID = 'wordpress-hooks';
+	public const GROUP_ID = 'wordpress-hooks';
+	
+	/**
+	 * Setting group name.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_NAME = 'WordPress Hooks with Priority Level';
 
 	/**
 	 * Settings container key to enable the `the_title` hook.
@@ -53,7 +60,7 @@ class WordPressHooksSettingsGroup extends SettingsGroup {
 	 *        title string in menus and in the title element, but Footnotes doesn't
 	 *        delete footnotes in them.
 	 */
-	const EXPERT_LOOKUP_THE_TITLE = array(
+	public const EXPERT_LOOKUP_THE_TITLE = array(
 		'key'           => 'footnote_inputfield_expert_lookup_the_title',
 		'name'          => '<code>the_title()</code>',
 		'description'   => '<a href="https://developer.wordpress.org/reference/hooks/the_title/" target="_blank">https://developer.wordpress.org/reference/hooks/the_title/</a>',
@@ -71,7 +78,7 @@ class WordPressHooksSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0  Move from `Settings` to `ReferenceContainerSettingsGroup`.
 	 *                Convert from `int` to `array`.
 	 */
-	const EXPERT_LOOKUP_THE_TITLE_PRIORITY_LEVEL = array(
+	public const EXPERT_LOOKUP_THE_TITLE_PRIORITY_LEVEL = array(
 		'key'           => 'footnote_inputfield_expert_lookup_the_title_priority_level',
 		'name'          => '<code>the_title()</code> Priority Level',
 		'description'   => 'The priority level determines whether Footnotes is executed timely before other plugins, and how the reference container is positioned relative to other features. 9223372036854775807 is lowest priority, 0 is highest. To set priority level to lowest, set it to -1, interpreted as 9223372036854775807, the constant <code>PHP_INT_MAX</code>.',
@@ -92,7 +99,7 @@ class WordPressHooksSettingsGroup extends SettingsGroup {
 	 *                Convert from `string` to `array`.
 	 *                Convert setting data type from `string` to `boolean`.
 	 */
-	const EXPERT_LOOKUP_THE_CONTENT = array(
+	public const EXPERT_LOOKUP_THE_CONTENT = array(
 		'key'           => 'footnote_inputfield_expert_lookup_the_content',
 		'name'          => '<code>the_content()</code>',
 		'description'   => '<a href="https://developer.wordpress.org/reference/hooks/the_content/" target="_blank">https://developer.wordpress.org/reference/hooks/the_content/</a>',
@@ -126,7 +133,7 @@ class WordPressHooksSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0  Move from `Settings` to `ReferenceContainerSettingsGroup`.
 	 *                Convert from `int` to `array`.
 	 */
-	const EXPERT_LOOKUP_THE_CONTENT_PRIORITY_LEVEL = array(
+	public const EXPERT_LOOKUP_THE_CONTENT_PRIORITY_LEVEL = array(
 		'key'           => 'footnote_inputfield_expert_lookup_the_content_priority_level',
 		'name'          => '<code>the_content()</code> Priority Level',
 		'description'   => 'The priority level determines whether Footnotes is executed timely before other plugins, and how the reference container is positioned relative to other features. 9223372036854775807 is lowest priority, 0 is highest. To set priority level to lowest, set it to -1, interpreted as 9223372036854775807, the constant <code>PHP_INT_MAX</code>. For <code>the_content</code>, this figure must be lower than 99 so that certain strings added by a plugin running at 99 may not be mistaken as a footnote. This makes also sure that the reference container displays above a feature inserted by a plugin running at 1200.',
@@ -148,7 +155,7 @@ class WordPressHooksSettingsGroup extends SettingsGroup {
 	 *                Convert from `string` to `array`.
 	 *                Convert setting data type from `string` to `boolean`.
 	 */
-	const EXPERT_LOOKUP_THE_EXCERPT = array(
+	public const EXPERT_LOOKUP_THE_EXCERPT = array(
 		'key'           => 'footnote_inputfield_expert_lookup_the_excerpt',
 		'name'          => '<code>the_excerpt()</code>',
 		'description'   => '<a href="https://developer.wordpress.org/reference/hooks/the_excerpt/" target="_blank">https://developer.wordpress.org/reference/hooks/the_excerpt/</a>',
@@ -166,7 +173,7 @@ class WordPressHooksSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0  Move from `Settings` to `ReferenceContainerSettingsGroup`.
 	 *                Convert from `int` to `array`.
 	 */
-	const EXPERT_LOOKUP_THE_EXCERPT_PRIORITY_LEVEL = array(
+	public const EXPERT_LOOKUP_THE_EXCERPT_PRIORITY_LEVEL = array(
 		'key'           => 'footnote_inputfield_expert_lookup_the_excerpt_priority_level',
 		'name'          => '<code>the_excerpt()</code> Priority Level',
 		'description'   => 'The priority level determines whether Footnotes is executed timely before other plugins, and how the reference container is positioned relative to other features. 9223372036854775807 is lowest priority, 0 is highest. To set priority level to lowest, set it to -1, interpreted as 9223372036854775807, the constant <code>PHP_INT_MAX</code>.',
@@ -187,7 +194,7 @@ class WordPressHooksSettingsGroup extends SettingsGroup {
 	 *                Convert from `string` to `array`.
 	 *                Convert setting data type from `string` to `boolean`.
 	 */
-	const EXPERT_LOOKUP_WIDGET_TITLE = array(
+	public const EXPERT_LOOKUP_WIDGET_TITLE = array(
 		'key'           => 'footnote_inputfield_expert_lookup_widget_title',
 		'name'          => '<code>widget_title()</code>',
 		'description'   => '<a href="https://codex.wordpress.org/Plugin_API/Filter_Reference/widget_title" target="_blank">https://codex.wordpress.org/Plugin_API/Filter_Reference/widget_title</a>',
@@ -205,7 +212,7 @@ class WordPressHooksSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0  Move from `Settings` to `ReferenceContainerSettingsGroup`.
 	 *                Convert from `int` to `array`.
 	 */
-	const EXPERT_LOOKUP_WIDGET_TITLE_PRIORITY_LEVEL = array(
+	public const EXPERT_LOOKUP_WIDGET_TITLE_PRIORITY_LEVEL = array(
 		'key'           => 'footnote_inputfield_expert_lookup_widget_title_priority_level',
 		'name'          => '<code>widget_title()</code> Priority Level',
 		'description'   => 'The priority level determines whether Footnotes is executed timely before other plugins, and how the reference container is positioned relative to other features. 9223372036854775807 is lowest priority, 0 is highest. To set priority level to lowest, set it to -1, interpreted as 9223372036854775807, the constant <code>PHP_INT_MAX</code>.',
@@ -231,7 +238,7 @@ class WordPressHooksSettingsGroup extends SettingsGroup {
 	 *                Convert from `string` to `array`.
 	 *                Convert setting data type from `string` to `boolean`.
 	 */
-	const EXPERT_LOOKUP_WIDGET_TEXT = array(
+	public const EXPERT_LOOKUP_WIDGET_TEXT = array(
 		'key'           => 'footnote_inputfield_expert_lookup_widget_text',
 		'name'          => '<code>widget_text()</code>',
 		'description'   => '<a href="https://codex.wordpress.org/Plugin_API/Filter_Reference/widget_text" target="_blank">https://codex.wordpress.org/Plugin_API/Filter_Reference/widget_text</a>. The <code>widget_text()</code> hook must be enabled either when footnotes are present in theme text widgets, or when Elementor accordions or toggles shall have a reference container per section. If they should not, this hook must be disabled.',
@@ -249,7 +256,7 @@ class WordPressHooksSettingsGroup extends SettingsGroup {
 	 * @since  2.8.0  Move from `Settings` to `ReferenceContainerSettingsGroup`.
 	 *                Convert from `int` to `array`.
 	 */
-	const EXPERT_LOOKUP_WIDGET_TEXT_PRIORITY_LEVEL = array(
+	public const EXPERT_LOOKUP_WIDGET_TEXT_PRIORITY_LEVEL = array(
 		'key'           => 'footnote_inputfield_expert_lookup_widget_text_priority_level',
 		'name'          => '<code>widget_text()</code> Priority Level',
 		'description'   => 'The priority level determines whether Footnotes is executed timely before other plugins, and how the reference container is positioned relative to other features. 9223372036854775807 is lowest priority, 0 is highest. To set priority level to lowest, set it to -1, interpreted as 9223372036854775807, the constant <code>PHP_INT_MAX</code>.',
@@ -260,6 +267,9 @@ class WordPressHooksSettingsGroup extends SettingsGroup {
 		'input_min'     => -1,
 	);
 	
+	/**
+	 * @see SettingsGroup::add_settings()
+	 */
 	protected function add_settings( array|false $options ): void {
 		$this->settings = array(
 			self::EXPERT_LOOKUP_THE_TITLE['key'] => $this->add_setting( self::EXPERT_LOOKUP_THE_TITLE ),
diff --git a/src/public/class-general.php b/src/public/class-general.php
index 186188a..a01943d 100644
--- a/src/public/class-general.php
+++ b/src/public/class-general.php
@@ -9,9 +9,6 @@
 declare(strict_types=1);
 
 namespace footnotes\general;
-		
-require_once plugin_dir_path( dirname( __FILE__ ) ) . 'includes/settings/general/class-reference-container-settings-group.php';
-require_once plugin_dir_path( dirname( __FILE__ ) ) . 'includes/settings/general/class-scrolling-settings-group.php';
 
 use footnotes\includes\{Footnotes, Convert, Settings};