Hi,

Please try using the below Custom CSS code and paste it to Dashboard >> Theme Settings >> Custom CSS >> Custom CSS for mobile section:

.wd-hover-quick.wd-quantity-overlap .wd-add-btn .product_type_simple {
   width: 100% !important;
}

We continue to develop and improve our most advanced WooCommerce theme area and are happy to announce a new update. Our team was working primarily in two directions: a new user-oriented interface in the dashboard and powerful eCommerce add-ons. It has a lot of new features, refactoring, and bug fixes but we did our best to prevent most breaking changes after the update.

After the update, you will not lose your work especially if you are using a child theme. You can do it at any time you want.

Best Regards.