New answers tagged fullscreen
I post this answer just to "close" the question, since I don't have the problem anymore and can't test what is correct and what is wrong answer. The problem somehow disappeared after update 9.0.3. I say "somehow", because right after I've performed the update the problem was still present, I noticed that it is not there anymore only several days after.
It seems from the apple support article https://support.apple.com/en-us/HT204948 there is no way to do this: The other window remains in full-screen view. You can switch to it with Mission Control, or use a Multi-Touch gesture such as swiping left or right with four fingers on your trackpad.
For me this works: First switch Chrome window mode to full screen mode by pressing the green dot on the top left side of the view: After that menu bar should be hidden so now enter full screen mode in youtube player: Enjoy your video on full screen without menu bar.
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