I read too fast: sorry.
> Doesn't the on/off radio buttons in MATE's monitor preferences behave
> in the same way?
I think that's what GNUser was referring to with
> I don't want to go to "Menu" "Screens" and turn it off because I want
> it back on when I move the mouse cursor.
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In the "Displays" utility of GOME Shell, you can click on a screen and choose
to deactivate it. I did that once with my built-in screen when my TV set was
connected (by HDMI). Now, whenever the TV set is plugged in, the built-in
screen is automatically deactivated (what I want). Right
