I have been using parallels in Full Screen with Use All Displays enabled for years on a mac with 3 monitors.
I use a multi touch trackpad to swipe between Mac and Windows with all displays switching at once, because I disable Apple's Displays have separate Spaces "feature". (why Apple thinks this is a good default setting is beyond me...)
Anyway, Parallels 12 doesn't work in full screen mode any more if you disable Displays have separate Spaces... doing so will give me 3 separate 'Spaces' each with only 1 of my windows displays and 2 black screens...
turning ON Displays have separate Spaces makes things just crazy when I want to go between systems... Swipe first display, move to second display and swipe, move to third and swipe... Time to go back to other system... Swipe first display, move to second display and swipe, move to third and swipe...
ugh...
Oh, and then there is the thing where Parallels 12 with a VM that must lock by group policy makes use all displays flicker and go crazy and drop back to a single display... so even if I did use Apple's Displays have separate Spaces and get used to the 3 swipes to switch between systems, I STILL can't use P12 on more than 1 display without things just going nuts every time I walk away from my system for a few minutes.
needless to say, I'm staying on 11 for the foreseeable future, and regret paying for 12.
I use a multi touch trackpad to swipe between Mac and Windows with all displays switching at once, because I disable Apple's Displays have separate Spaces "feature". (why Apple thinks this is a good default setting is beyond me...)
Anyway, Parallels 12 doesn't work in full screen mode any more if you disable Displays have separate Spaces... doing so will give me 3 separate 'Spaces' each with only 1 of my windows displays and 2 black screens...
turning ON Displays have separate Spaces makes things just crazy when I want to go between systems... Swipe first display, move to second display and swipe, move to third and swipe... Time to go back to other system... Swipe first display, move to second display and swipe, move to third and swipe...
ugh...
Oh, and then there is the thing where Parallels 12 with a VM that must lock by group policy makes use all displays flicker and go crazy and drop back to a single display... so even if I did use Apple's Displays have separate Spaces and get used to the 3 swipes to switch between systems, I STILL can't use P12 on more than 1 display without things just going nuts every time I walk away from my system for a few minutes.
needless to say, I'm staying on 11 for the foreseeable future, and regret paying for 12.