Remove an entry from backend settings

If you want to remove an entry from the backend settings page, use the following code:

        Event::listen('system.settings.extendItems', function($manager) {
            $manager->removeSettingItem('<owner>', '<code>');
        });

Where <owner> is the plugin id (i.e. author.pluginName)

and <code> is the key for the config entry used in the plugin registration file's registerSettings method call.