Sides of screen being cut off in games.

Just got my S8 Plus today and it's amazing. I am having this one problem though and I seem to have tried everything I can find to fix it to no avail.

This is what I'm talking about and This is how it should be.

As you can see it cuts off a few mm off each side. I've tried the app in both normal and full screen mode, also using all resolution sizes. Stumped.