Remove Extra Submenu from Plugin - Advanced Algorythms

To remove the extra menu item from plugin this will work:

add_menu_page('Main Menu', 'Main Menu', 'menu_option', __FILE__, 'Menu'), 
             plugins_url('/favicon.png') );
add_submenu_page(__FILE__, 'About', 'About', 'menu_option', 'about', 'AboutPage');
add_submenu_page(__FILE__, 'Settings', 'Settings', 'menu_option', 'settings', 'SettingsPage');
remove_submenu_page('LINK YOU SEE ON MOUSE OVER','LINK YOU SEE ON MOUSE OVER');

However to get where it says ‘submenu/submenu.php page’ mouse over the extra link to identify what you need to use for these two parameters. Notice that all of the standard WordPress Admin links main link (Pages, Appearance, Users, Settings) the first item in the sub menu links to the same page as the main menu! This just how it works in WordPress!