I have a custom taxonomy registered for custom post type. It has ‘public’, and ‘show_in_nav_menus’ arguments set to true, but it still doesn’t appear in nav-menus.php. If I set those arguments to custom post type, it works all right… what could be the problem?
我为新文章类型（custom post type）注册了一个新的分类（register_taxonomy），’show_in_nav_menus’ 都设置为 ‘true’，但是在 “外观”-> “菜单” （nav-menus.php）里没有显示出来。可是新文章类型（custom post type）显示了，这是为什么？
好吧，看下图你或许就明白了！
But don’t forget checked it in Screen options:
