I would close the program and reopen it. What Os?
@cwbullet
I have closed/opened. Rebooted. Uninstalled/Reinstalled
This is on a MacBook Pro
OS version 11.1
2.4 Ghz 8 core Intel i9
65 GB memory
Intel UHD Graphics 630 1536 MB
I discovered that if PrusaSlicer is opened and used from the laptop monitor everything works.
However if I use the program on an additional monitor the issue happens and can only be resolved by closing the program and opening/using prusaslicer from the laptop monitor.
I am not sure why that is the issue but I have found a work around
Known issue. There are multiple github entries about this. I think there are a few in this very forum too but the search is so bad you wont find them.
It all seems to be down to some drivers from Nahimic. They get installed as part of a lot of stuff apparently so check is there is any software that directly or indirectly use the Nahimic drivers.
https://github.com/prusa3d/PrusaSlicer/issues/5573
https://github.com/prusa3d/PrusaSlicer/issues/5091
https://github.com/prusa3d/PrusaSlicer/issues/2142
https://github.com/prusa3d/PrusaSlicer/issues/4793
https://github.com/prusa3d/PrusaSlicer/issues/2522
https://github.com/prusa3d/PrusaSlicer/issues/3689