您可以从屏幕选项中删除导航菜单元框链接，但如果您想通过自定义代码删除，请尝试以下代码，只需将其复制并粘贴到您的函数中即可。php文件：

function custom_remove_menu_link_types() {
    global $wp_meta_boxes;
    foreach ($wp_meta_boxes[\'nav-menus\'][\'side\'] as $nav_menus) {
        foreach ($nav_menus as $nav_id => $nav_menu) {
            // remove all menu\'s and keep only one
            if ($nav_id !== \'add-custom-links\') {
                remove_meta_box($nav_id, \'nav-menus\', \'side\');
            }
        }
    }
}
add_action(\'admin_head-nav-menus.php\', \'custom_remove_menu_link_types\', 10);