function plt_hide_come_back_menus() {
//Hide the "Tools → Scheduled Actions" menu.
remove_submenu_page('tools.php', 'action-scheduler');
//Hide the "Settings → Come Back!" menu.
remove_submenu_page('options-general.php', 'come-back');
}
add_action('admin_menu', 'plt_hide_come_back_menus', 11);