right hand corner of screen gone psychedlic, answers below have not helped. MacBook Air on Catalina

Hello!

Press Shift + Command + 3 to take a screenshot. Resize the screenshot to confirm whether the anomaly is caused by a software issue or due to a damaged screen.

If it is caused by a software issue, then consider updating (that is if your MacBook supports macOS BigSur), before attempting any other solutions.

If it is due to a hardware problem, then refer to this article:

About LCD display pixel anomalies for Apple products released in 2010 and later - Apple Support

Hope this helps!

-flef

Take a screenshot, open it with Preview, and determine if the visual anomaly also appears in that screenshot.

Take screenshots or screen recordings on Mac - Apple Support