Pixelated Macbook Air Screen

Your photo is rather small to see detail, but I think I can see enough of the problem.

Which version of MacBook Air? (Year of model). It looks like a display problem so if this is a new machine and still in warranty your best plan is probably Apple Service. Check warranty status at Check Your Service and Support Coverage - Apple Support and use link https://getsupport.apple.com/ to start arranging repair.

Unfortunate. I suggest give others time to come up with alternative suggestions before you commit to Apple Service.

One thought. Does it look like the display has lost the right edge, or is the expected picture compressed with random noise on the excess width? (The extreme right end of the menu bar is usually time/date).

If you have an external display available and the means to connect it, that will show whether it is a fault in the display itself. Making a screen capture (Command+Shift+3) and emailing it to your iPhone so you can view the picture on a different screen will show whether the video drive system is the problem.

It looks like screenshot is ok but the right edge of the display is corrupted? That’s 90% going to be a display panel fault. AppleService as above.