Administration: Limit column width

With my new product—1x/week PT—I got a little carried away with the accompanying description. As a result, the column width has become too wide, and the layout isn’t as clean as it used to be. (A horizontal scrollbar has appeared.)

I think I’d prefer a limited column width (with a shortened description), so that I can see the full description as a tooltip when I hover over it or something like that.