nat8100
You are stating that the "box" is too wide. By how much? The width is relative to the template. If you are using huge category names, but only want the default 125 width; you are kidding yourself. Clarify your request.
This is a simple contribution. I am not your php or osC teacher. By downloading this store, you are expected to attempt to learn how to use and customize it. Think of it as a new job with lots of on-the-job experience. Not just a free shop with endless free support.
So, don't install 100's of "contributions" and expect smooth sailing. Make mistakes and learn. If this is time sensitive and for a paying client (even yourself), you should have bought a store instead of relying on a free one.