Why can't I select a post type when editing posts?

Symptom: When configuring a form to create or edit posts, some of the site’s post types are missing from the Post type dropdown — even though they’re registered and you can see them elsewhere in WP admin.

Cause: A post type only appears in that dropdown if its show_ui argument is true. If show_ui is explicitly false (or defaults to false because public is false), Advanced Forms treats the post type as not editable through admin UI and hides it from the list.

Fix: Set show_ui to true on the post type’s registration:

add_action( 'init', function () {

    register_post_type( 'my_post_type', [
        'public'  => false,
        'show_ui' => true, // makes the post type appear in the AF Post type dropdown
        // ...
    ] );

} );

A couple of things to note:

• If show_ui isn’t defined at all, it falls back to the value of public. So a post type registered with 'public' => false and no show_ui will also be hidden from the dropdown.
• show_ui only controls whether WP exposes the post type to admin UIs (including AF’s form configuration). It doesn’t change anything about how the post type behaves on the front end.