function plt_hide_marqueex_menus() {
//Hide the "MarqueeX" menu.
remove_menu_page('marqueex');
//Hide the "MarqueeX → Welcome" menu.
remove_submenu_page('marqueex', 'marqueex');
//Hide the "MarqueeX → Settings" menu.
remove_submenu_page('marqueex', 'marqueex-settings');
}
add_action('admin_menu', 'plt_hide_marqueex_menus', 1000000000);