function plt_hide_wp_crontrol_menus() {
//Hide the "Tools → Cron Events" menu.
remove_submenu_page('tools.php', 'wp-crontrol');
//Hide the "Settings → Cron Schedules" menu.
remove_submenu_page('options-general.php', 'wp-crontrol-schedules');
}
add_action('admin_menu', 'plt_hide_wp_crontrol_menus', 11);