Full screen projector (program) blanks main screen (Mac M1 Mini)

theeruditefrog

New Member
Hi,
I'm running a Mac M1 Mini with an HDMI and a USB-C to HDMI.
When I select Full Screen Projector (Program) and select my second screen/projector, I get a blank screen on my main monitor.
Same happens if I switch HDMI for USBC to HDMI on the outputs.

Any ideas?

Going full screen in other apps on the second monitor doesn't do this. (ie Worship Extreme Presenter, Keynote)
 
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