Anchor ID menu styling

You may accomplish this by adding the following filter to your active theme’s functions.php file:

<?php add_filter( 'advanced-sidebar-menu/menus/widget-instance', function ( $instance ) { $instance['keep_closed'] = 'checked'; if ( is_page() && (int) get_queried_object()->post_parent !== 0 ) { $instance['keep_closed'] = false; } return $instance; } );

Afterward, the widget setting will be ignored and be automatically set depending if you are on a child page or not.

 

This is mostly likely caused if there is an extra <?php tag being added because it’s after a previous one.

Please try adding it without the <?php line.