Welcome to Autodesk Forums!

Hi @Anonymous,

It is knowing issue with some Radeon graphic cards.
Please look here for workaround:
https://knowledge.autodesk.com/support/autocad-for-mac/troubleshooting/caas/sfdcarticles/sfdcarticles/mosaic-or-pixelated-graphics-appear-in-autocad-for-mac-2021.html?_ga=2.14905264.720198027.1599463203-169688753.1599463203#:~:text=To%20solve%20the%20issue%2C%20run,making%20the%20change%20restart%20AutoCAD.