Hi,
I’m afraid this is not possible either. This is hard coded into the script files, which I do not recommend changing, as any of the future updates will simply override them and revert back any changes.
We are in a middle of a huge rework on the filters system, I could add a feature request to turn off this behavior.
You can try a custom code, although I don’t know if this will work in all of the cases:
add_action('wp_footer', 'asp_add_menu_stop_checkbox_parent_child');
function asp_add_menu_stop_checkbox_parent_child() {
?>
<script>
jQuery(function($){
$('*[data-lvl]').data('lvl', 'null');
});
</script>
<?php
}This should remove the attribute which is used to recongize the parent-child structures.