Help for Aimeos

I appreciate the response. However, the client is coming from WordPress and all of the category names are unique. I am confused trying to think of an instance of when the category name wouldn't be unique. Maybe I am misunderstanding.

I am testing out Aimeos for the first time and have some custom products added and categories assigned. However, when I view a category on the front of the site it shows the URL as "/shop/Books~15". How do I remove the "~15" from the URL?