Please go to the Device Manager of Windows, from there expand Display Adapters.
Disable the graphic card and then open Lightroom , go to the preferences of Lightroom , then the Performance tab and uncheck the option for " Use Graphics Processor " .
Close Lightroom and go back to the Device Manager and enable the Display Adapter.
Open Lightroom and then work in Lightroom and check if it works fine.
I've just tried this and I because Lightroom is freezing and isn't allowing
me to do anything, I can't change the preferences in it It still isn't
Please shutdown your computer once, and then restart it.
Once the computer is restarted then follow the above steps to disable the Graphic Card from the Device Manager and so on