What props do you have inside the room designation?
1x Lectern of Knowledge
1x Book Case
Does it say you're missing props? Is anyone occupying it?
The issue is that I can't designate it in the first place, it's not in the room placement list
Oh, I misunderstood. Ok, I think what's happening is that the right room overlay is obscuring the menu. Try minimizing it with the [ _ ] button on the right panel.
This is a silly UI issue (that's fixed in the next 0.10.0.0) update and can happen on smaller resolutions. Sorry about this.