So, here's my problem. I'm using the new (2.5) interface at 1x scale, and the top and bottom of the program extend well beyond the edges of the screen (which has a resolution of 1366x768).
I feel like I'm taking crazy pills, because on my old Windows 7 laptop, whose screen had the same resolution, I did not have this problem: the new interface fit just fine.
I've tried full screen, but it crashes. I can use the classic interface at 2x scale, but it's a pain to use.