function plt_hide_ultimate_multisite_menus() {
//Hide the "Tools → Scheduled Actions" menu.
remove_submenu_page('tools.php', 'action-scheduler');
//Hide the "Multisite Ultimate" menu.
remove_menu_page('wp-ultimo-multisite-setup');
}
add_action('admin_menu', 'plt_hide_ultimate_multisite_menus', 101);