Doesn’t fit to screen?

good game but it keeps locking and showing up bigger than my screen, this is a brand new MacBook Pro. I updated the OS and made sure everything is on current version. Game is not compatible with El Capitan?
I don’t know what’s going on, but after every round it locks up, I have to command-Q out and then go back in, very frustrating.
I do like the gameplay though.

ColdDeadHand about Blood & Glory