The first thing that you should try is to switch off the GPU support from the Lightroom preferences and check if that helps to fix the issue.
Go to Lightroom > Preferences > Performance tab > Uncheck "Use Graphics Processor" > Restart Lightroom.
https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-gpu.html
Another step is to try to reset the Lightroom preferences.
https://www.lightroomqueen.com/how-do-i-reset-lightrooms-preferences/
It's recommended to backup your preferences before you reset the preferences to the default settings:
https://helpx.adobe.com/lightroom-classic/kb/preference-file-and-other-file-locations.html
If this doesn't help we need more informations about your environment.
Please provide also a copy of your 'System Info'. This can be get from the LrC Help > System Info menu item.
There's a copy button in the System Info dialog. Press this button and paste the info into your next forum post.