How do I reduce the size of the File->Options window?

Somewhere along the way, I increased the size of the window that pops up when you execute a

File->Options->Options

from the ribbon.

When I do this, it brings up the usual cascading list of main options, sub options, etc. But, annoyingly, the window I see is so wide that the actual selections are pushed off the main screen. What I find when I attempt the normal Windows thing of grabbing the side of the window and moving inwards is that it doesn't allow this. I can make the window larger in the horizontal direction, but it will not get smaller.

Anyone know if this is something i can adjust via a .ui file of some sort, or do I need to access the registry to fix it? In the old days I'd be able to hit the registry and find where this window is getting its initial size specs, nowadays we're locked away from such things.