I woke my SP3 from sleep, and the resolution is horrible

I turned on my computer this morning (I am in the bad habit of putting my computer to sleep all night by closing the type cover), and I didn't see anything happen. That said, I was doubtful I actually pressed the power button, so I pressed it again. I got the Surface logo, then the circle of dots, and my lock screen.

However, once I got to my lock screen I saw that the resolution was blurry and had what I estimate to be 1.5cm of black bars on either side of the screen. I tried restarting, which also installed updates, but it stayed like this. Everything works just fine, it's just crammed into this blurry, small resolution.

Any help on getting it back to the resolution it was at before?