Hi,
Unfortunately that is the same thing just different icon, but we can do something with CSS, like you can hide all sub-menu items until the parent item is checked, because we can use the parent:checked attribute to show / hide the sub-categories, if you’re okay with that, please add this CSS to wp-admin > Appearance => Customize > Additional CSS:
.wpf_items_wrapper .wpf_item .wpf_submenu {
display:none;
}
.wpf_items_wrapper .wpf_item input[type="checkbox"]:checked + label + .wpf_item_count + .wpf_submenu,
.wpf_items_wrapper .wpf_item input[type="checkbox"]:checked + label + .wpf_submenu {
display:block;
}
Please let us know how it works for you.