Just slide's down, but not up.

So, installed your plugin, but free version doesn’t really slide’s up after the sliding down.

Besides, I do like the plugin being so simple, but found too invasive so much advertising. Decided to uninstall, but took your jquery as a base to produce this:

<script>
(function($){
$(document).ready(function() {
$(‘.woocommerce.widget .product-categories li.cat- parent’).prepend(‘<div class=”cat-menu-close”></div>’);
$( document ).on( “click”, “.woocommerce.widget .product-categories li.cat-parent:not(.opened) > .cat-menu-close”, function(e) {
$(this).next().next(‘ul.children’).slideToggle();
});

});
})(jQuery);
</script>

Thank you.

https://wordpress.org/plugins/expandable-accordion-categories-ultimate-for-woocommerce/