When clicking Format->Conditional->Manage… the popup shows up, but then when I select one of the conditional formats and click Edit… the popup disappears and all the controls in Calc go gray. I can’t find a popup window anywhere, but it seems to accept input as pressing ESC will reopen the Manage Conditional Formatting popup and return color to the controls in calc. This happens every single time I try, and it also happens if I try to create a new conditional format.
It also happens if I try it in a completely new calc sheet.
I tried updating LibreOffice to the newest version, but it didn’t make any difference. My computer has been restarted multiple times since the problem appeared and it hasn’t made any difference.
Microsoft Surface 7 i7-1065G7, 16GB RAM
Windows 10 64-bit, version 10.0.18362