function plt_hide_wp_load_gallery_menus() {
//Hide the "WP Load Gallery" menu.
remove_menu_page('wp-load-gallery');
//Hide the "WP Load Gallery → Galleries" menu.
remove_submenu_page('wp-load-gallery', 'wp-load-gallery');
//Hide the "WP Load Gallery → Cloud" menu.
remove_submenu_page('wp-load-gallery', 'load_gallery_cloud');
}
add_action('admin_menu', 'plt_hide_wp_load_gallery_menus', 11);