someone else having this problem?

^^

I tried alt+enter, F11, and i cant find anything in settings.

Ok, so what is the deal with main and sub class? What is the difference between, for example, making a Warrior/Samurai instead of Samurai/Warrior?

Not sure if it's a feature that I've missed somewhere. But Flandre keeps dropping in levels everytime they're deployed. She went from lvl 90 to lvl 70 while every other unit keeps leveling up.