function plt_hide_udinra_all_image_sitemap_menus() {
//Hide the "Settings → Udinra Sitemap" menu.
remove_submenu_page('options-general.php', 'udinra-all-image-sitemap.php');
}
add_action('admin_menu', 'plt_hide_udinra_all_image_sitemap_menus', 11);