Thanks for the suggestion, but this is not an ideal solution. While it does resolve the problem of the OS X menubar appearing when the mouse is close to the top of the screen, there are two unwanted side effects:
1. As the original poster mentions, when "Use OS X full screen" is disabled, Parallels takes over the active desktop. To recreate the behavior of OS X's full screen, I need to first create a new desktop space, move the guest machine window there and then go fullscreen. This is kind of troublesome, but it would be bearable if it weren't for the second issue.
2. When using multiple displays with "Use OS X full screen = DISABLED", Parallels does strange things to the dock and menubar - they disappear on the monitor which is not currently in focus. I have attached screenshots to show this. This is my usual way of working (Windows on one monitor, OS X on the other) and the menubar/dock blinking in and out when I switch focus from one monitor to the other gets annoying very quickly.
I really hope that the issue with "Use OS X full screen" enabled gets resolved because that is the only real solution for me. One which worked perfectly with Parallels 10 on Yosemite.
Last edited: Nov 26, 2015