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Screenshots of the UI changes on the Mac - in my opinion it is now just wasting a lot of screen estate for zero benefit.
On non-Macs they're adding an extra usability issue by hiding the top menu bar. I've gove back to 2.7.4 for now - fortunately I had my configuration in git.
Up to 2.7.4:
2.8.4:
I have no idea. They decided to put a notch with the webcam in the middle of the screen, so I'd not be able to use that space properly with anything else anyway.
My point here wasn't about mac, though (it was just handy for doing the screenshot at this moment , though it's my least used platform for this: I had it upgraded, and as I have no intention of upgrading it on my Linux system after that experience I made the screenshot before the downgrade) - my point was the needless waste of space in the newer PrusaSlicer, which applies on all platforms.