I unregistered a custom taxonomy form the theme I'm using:

function wpse314876_unregister_taxonomy() {
    unregister_taxonomy_for_object_type( 'page_category', 'page' );
add_action( 'init', 'wpse314876_unregister_taxonomy' );

But in the all pages overview (/wp-admin/edit.php?post_type=page) it shows still an empty drop-down filter list. I can remove all category drop-down but that's not what I want as I already added a custom drop-down taxonomy filter-list.

The drop-down appears as a little empty list empty list and its HTML looks like that:

<select name="page_category" id="page_category" class="postform">

How can I remove just what empty drop-down list?


After I little digging I found the right action in the parent theme. The function looked like that (actually exactly the example I linked above):

// Add page category filter //

add_action('restrict_manage_posts', 'uncode_page_filter_post_type_by_taxonomy');

function uncode_page_filter_post_type_by_taxonomy() {
    global $typenow;
    $post_type = 'page'; // change to your post type
    $taxonomy  = 'page_category'; // change to your taxonomy
    if ($typenow == $post_type) {
        $selected      = isset($_GET[$taxonomy]) ? $_GET[$taxonomy] : '';
        $info_taxonomy = get_taxonomy($taxonomy);
            'show_option_all' => sprintf(esc_html__("Show All %s", 'uncode'), $info_taxonomy->label),
            'taxonomy'        => $taxonomy,
            'name'            => $taxonomy,
            'orderby'         => 'name',
            'selected'        => $selected,
            'show_count'      => true,
            'hide_empty'      => true,

add_filter('parse_query', 'uncode_page_convert_id_to_term_in_query');
function uncode_page_convert_id_to_term_in_query($query) {
    global $pagenow;
    $post_type = 'page'; // change to your post type
    $taxonomy  = 'page_category'; // change to your taxonomy
    $q_vars    = &$query->query_vars;
    if ( $pagenow == 'edit.php' && isset($q_vars['post_type']) && $q_vars['post_type'] == $post_type && isset($q_vars[$taxonomy]) && is_numeric($q_vars[$taxonomy]) && $q_vars[$taxonomy] != 0 ) {
        $term = get_term_by('id', $q_vars[$taxonomy], $taxonomy);
        $q_vars[$taxonomy] = $term->slug;


To remove them I added a simple remove_action() to my child-theme function.php.

 * Remove page_category filter and parse query
remove_action('restrict_manage_posts', 'uncode_page_filter_post_type_by_taxonomy');
remove_action('parse_query', 'uncode_page_convert_id_to_term_in_query');
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