Press ALT-SPACE, then M. Then move the window with the arrow keys and you should be able to get it where you want it.
It's a Windows issue. Let me know if that solves your problem!
Actually I think the problem is that your screen is not 1920x1080 which is currently the minimum supported.
The reason being that there’s a ton of data on screen at once, and a very big map. If I were to support smaller sizes by scaling it, it would not be readable. Sorry about that.
I was under the impression that pretty much everyone used 1920x1080 for gaming these days, but it’s clear that some retro gamers prefer 1366x768 laptops. In order to have a decent experience on those screens I’m going to have to redesign the interface when I find the time.