What kind of hardware is in your computer (CPU, amount of RAM, type of graphics board, etc)? Was the installation of Adobe Illustrator working properly on this computer previously?
Sometimes the drivers for graphics cards or attached periphreals, such as graphics tablets, can cause problems with Adobe Illustrator. NVidia released an update for its RTX graphics cards a few days ago. I run the Studio driver on my computers rather than the default Game Ready Driver.
If driver updates won't work I would suggest installing either a previous build of Adobe Illustrator or even trying the Beta release.
... View more