When in the Develop module my second monitor becomes blurry. This happened at the time of 10.2 update. I am running iMacPro and MacOS Big Sur 11.2.3. Interestingly, LR system info incorrectly shows I'm running MacOS 10.16.0.
The Max 2021 Photography products updates have been released and include remedies for this topic.The updates will be rolling out worldwide, October 26 and 27, 2021. If you do not see the updates in your Creative Cloud Desktop app, you can refresh the apps to see if the updates are available in your region.The keyboard shortcut to refresh is [Cmd/Ctrl] + [Opt/Alt] + [ R ].
Note: iOS and Android updates may take up to a week to appear in your App Store.