turn on / off presentation mode

abccC2

Junior Member
Sometimes when I connect an external screen get a message of type "do you want to show a presentation?"
Have not fully understood how to respond to this but sometimes the net result is that on the Mac the screensaver ceases to engage.
Where do I have manual control over whatever it is that "presentation mode" does? Have been through all the settings for Windows 10 and Parallels and just can't find it.
 
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