WordPress – Add/Edit Post Screen Options not showing Categories

1 comment

1. in wp-admin/includes/screen.php we see:

   <div class="metabox-prefs">
       <?php
           meta_box_prefs( $this ); // draw checkboxes in screen options
       ?>
   </div>
   

   and meta_box_prefs function takes in account the get_hidden_meta_boxes function:

   function meta_box_prefs( $screen ) {
       global $wp_meta_boxes;
   
       $hidden = get_hidden_meta_boxes($screen);
   
       // hide some boxes
   }
   

   An this function includes 2 filters default_hidden_meta_boxes and hidden_meta_boxes:

   function get_hidden_meta_boxes( $screen ) {
       // code
       $hidden = apply_filters( 'default_hidden_meta_boxes', $hidden, $screen );
       // code
       return apply_filters( 'hidden_meta_boxes', $hidden, $screen, $use_defaults );
   }
   

   ---

   Mi conclusion is that one of your plugins is hiding categories in your screen options.

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