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Maximising the window is not supported on Photoshop CC 2017 release under the new Mission Control in High Sierra. As of versions Lightroom CC (2015), this feature is supported.
However, if you wish to go full screen mode, you can do so by selecting the "Full Screen Mode With Menu Bar" option;
Photoshop does not have the green Full-screen double-headed arrow button on Photoshop or Bridge in either my Sierra or High Sierra laptops. Just the Green +
That sounds normal. Pressing F on your keyboard will get your image into Fullscreen.
I had the ability to do that earlier yesterday, to use the little green button with the two arrows. I didn't change anything in my system, it just changed to the + out of nowhere.
But more important look what happens when I go to full screen mode (A bar where the dock was stays there, and adobe won't let me expand the window beyond that. I know it's kinda hard to see, my wallpaper is a bit dark.)
I know I can hide the toolbar (in all screens), but I don't want to do that. Fullscreen mode works fine in Chrome, Lightroom and all other apps (the dock disappears, and windows go all the way to the edge of the screen)
That explains it. My dock is on "auto-hide."
This is unacceptable, I pay monthly for a program that doesn't support the mac way of moving fullscreen apps to spaces.
Yet Lightroom offers this functionality. WHAT IS GOING ON!