Metabox

Hmm, I just set a brand new post type with CPTUI and had the WP core categories option checked and the metabox/dropdown along the side showed up.

Can you provide the blob of text on the right textarea, when you visit the Tools menu in CPTUI’s admin menu, and then the “Post Types” tab? Curious if some other setting may be interfering unintentionally.

You mean this?

{“woordenboekitem”:{“name”:”woordenboekitem”,”label”:”woordenboekitems”,”singular_label”:”woordenboekitem”,”description”:””,”public”:”true”,”publicly_queryable”:”true”,”show_ui”:”true”,”show_in_nav_menus”:”true”,”show_in_rest”:”true”,”rest_base”:””,”rest_controller_class”:””,”has_archive”:”false”,”has_archive_string”:””,”exclude_from_search”:”false”,”capability_type”:”post”,”hierarchical”:”false”,”rewrite”:”true”,”rewrite_slug”:””,”rewrite_withfront”:”true”,”query_var”:”true”,”query_var_slug”:””,”menu_position”:””,”show_in_menu”:”true”,”show_in_menu_string”:””,”menu_icon”:””,”supports”:[“title”,”editor”,”thumbnail”,”custom-fields”],”taxonomies”:[“category”],”labels”:{“menu_name”:”Woordenboek item”,”all_items”:””,”add_new”:””,”add_new_item”:””,”edit_item”:””,”new_item”:””,”view_item”:””,”view_items”:””,”search_items”:””,”not_found”:””,”not_found_in_trash”:””,”parent_item_colon”:””,”featured_image”:””,”set_featured_image”:””,”remove_featured_image”:””,”use_featured_image”:””,”archives”:””,”insert_into_item”:””,”uploaded_to_this_item”:””,”filter_items_list”:””,”items_list_navigation”:””,”items_list”:””,”attributes”:””,”name_admin_bar”:””},”custom_supports”:””}}

Yes. let me look things over and I’ll get back to you soon.

Thanks in advance!

Just imported your settings there, and the categories dropdown, which is equivalent to the metabox with Gutenberg is showing up.

https://cloudup.com/c2udVI2PVx1

Should be visible on the right there, with 3 terms.

Just in case it’s simply not set to show for your user, can you click the 3 dots in the upper right corner, select “Options” at the bottom of the context menu that shows up, and confirm that “categories” is checked in the “Document Panels” section?

Beyond that, I suspect something from other parts of your site’s code may be interfering somehow.

Thanks for your reaction!

I checked the options, but ‘categories’ is not available in the document panels sections.
Something is wrong indeed. Could it be another plugin? Anyway, we will test it by deactivating the other plugins…

Sounds like a plan. Thanks.

A quick check learned that the plugin WP REST API Controller was the problem.
We disabled the plugin and know it works.

Many thanks!

Huzzah! Glad I could help point the way.