Is there a way to prevent a category from showing up in the "Search" drop down?

The page that is governed by the ProductList.ascx. It's the first page of the cart. I have a list of services that I don't want to appear in the cart so I deactivated them all but the category that I was required to assign to them still appears in the drop down.

I was able to remove it using some javascript but I was just wondering if there was another way.