How to activate “Description” metabox for menu item programmatically?

2 comments

1. Remove the description from the user meta value managenav-menuscolumnshidden:

   add_filter( 'manage_nav-menus_columns', 'enable_nav_menu_description_by_default' );
   
   function enable_nav_menu_description_by_default( $columns )
   {
       $desc_key = 'managenav-menuscolumnshidden';
       $hidden   = get_user_option( $desc_key );
       $user_id  = wp_get_current_user()->ID;
   
       if ( ! $hidden )
       {
           update_user_option(
               $user_id,
               $desc_key,
               array ( 0 => 'link-target', 1 => 'css-classes', 2 => 'xfn' )
           );
       }
       elseif ( FALSE !== ( $key = array_search( 'description', $hidden ) ) )
       {
           unset( $hidden[ $key ] );
           update_user_option( $user_id, $desc_key, $hidden );
       }
   
       return $columns;
   }
   

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2. If you’re looking to output the menu description here is a useful tutorial using WordPress Walker Menu class to enchance the menu WordPress Walker Menu Tutorial

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