WordPress / WooCommerce bug – unable to click open "Product Categories"

I have WooCommerce installed to my WordPress site https://saengreenusa.com/. All of a sudden , I am unable to click Product Categories under Appearance>Menu in order to add to the Products dropdown on the site. It should slide open – it doesn’t. I’ve tried it in different browsers, clearing the cache, and on different computers and none of the categories under Menu will respond when clicked. Apparently, WooCommerce updates more frequently than WordPress does, and this allows for bugs. If anyone has any idea how to fix/find this issue, please let me know. Thanks!