Trying to select an option from Text Scale while in Fullscreen Mode is a guessing game 
The good news is that the selected size is displayed correctly
(Running on Windows 8.1 Update 1, 1080p monitor, no dpi scaling, overall a pretty normal setup)
You’ve got ones, a two and three, four six and eight—what more do you need? :mrgreen:
Just to figure out what is going on here though—as on my screen you can read all of these numbers just fine—what is your monitor resolution?
Sorry for the delay. I’m using the native resolution of my all-in-one pc: 1920x1080 (per my original post).