Custom PHP code that makes Popup Maker's Enabled column sortable

make_popup_maker_enabled_col_sortable.php

<?php 
  /**
   * Make Popup Maker's Enabled column sortable
   */

  // Add 'enabled' to sortable columns
  add_filter( 'manage_edit-popup_sortable_columns', function( $columns ) {
      $columns['enabled'] = 'enabled';
      return $columns;
  }, 20 );

  // Handle the sorting logic for the enabled column
  add_filter( 'request', function( $vars ) {
      // Check if we're viewing the "popup" post type
      if ( isset( $vars['post_type'] ) && 'popup' === $vars['post_type'] ) {
          // Check if we're sorting by 'enabled'
          if ( isset( $vars['orderby'] ) && 'enabled' === $vars['orderby'] ) {
              $vars = array_merge(
                  $vars,
                  [
                      'meta_key' => 'enabled',
                      'orderby'  => 'meta_value_num',
                  ]
              );
          }
      }

      return $vars;
  }, 20 );