Hi, I'm going to help you to make the fullscreen works, I'm running OS X 10,10.5 (no very different to 10.11 or later), it worked for me, and I hope the same for you.
First, just "read" the following guide: htt##############################ME BACK here!
Maybe, you can't get the downloads from the guide, so here you have:
###################################################################################################################################If you can't go to "/Library/Application Support/SIMBL/Plugins", maybe you should go to"~/Library/Application Support/SIMBL/Plugins", so you can do that with a right click in the Finder and then "Go to folder" (put "/Library/Application Support/SIMBL/Plugins" in that window, without the "; so you can to this and then paste the bundle.
Then you need to restart.
Now you will be able to turn the fullscreen ON, try clicking the grey button of the window, if the problem continues, try to Turn the FullScreen On and Off some times, in the Settings Menu (Esc); or try pressing Alt and F11 at the same time (or go to settings --- help, and look for the keyboard combination.
I hope you can fix this.
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