I was already aware of the green arrow expand thing, but I have plenty of screen space to spare... "click to see the rest" isn't nearly as convenient as being able to maximize the program and be done with it.
I was not aware that I could expand/shrink the file list view by double clicking. This will probably be my favorite workaround from now on. I've never used the Disc Layout Editor much, but I can see how that would be another reasonable workaround. But the point is that it is trivial to allow a GUI to resize. It most definitely isn't a showstopping problem, but it was simple enough to submit a feature request.