Is your feature request related to a problem? Please describe.

For a long time I thought that the OCR function (Windows 10 OCR) just didn't work properly, because I got no results every time. Today I found out that I had turned on the screen curtain feature of NVDA, so the OCR only saw a black screen. After I turned off the screen curtain, the OCR worked fine.

Describe the solution you'd like

If that's technically possible, I'd like it when NVDA warns you when you try to use the OCR feature while Screen Curtain is on.

Describe alternatives you've considered

I don't know any alternatives, this seems to me the easiest solution.

Additional context

I am using Windows 10 1909 (64-bit) build 18363.1198 and NVDA 2020.3.