A question?. I have a Mac (27" Retina 5K, 32GB, I7 4GHz), which was a recent upgrade from my older early 2011 2.93GHz i7. On both I've always used multiple monitors, and have not had many problems (there was a problem a while ago, with 'breakup', and random display faults on the second monitor - fixed by loading a replacement 'displaylink' driver <http://www.displaylink.com/downloads/osx>). I've not seen any significant problems with the second display (though if you follow another thread here, I've now had to go back to Parallels 11, because of another issue). However wonder if in part this is because I never use 'full screen' mode?. Because I like to be able to reduce the size of my 'Windows' environment, only expanding it to fill the screen when needed, I've always kept the Windows 'windowed' (modality mode). Just stretching this to fill the monitor when required. Now, operating like this, the difference in the native display handling of Sierra, doesn't seem to enter the equation. Like this Parallels behaves basically the same both in El Capitan, and Sierra. I stick the Apple controls onto the screen that isn't containing Windows. So, what is the disadvantage in using Windowed mode?. Obviously the desktop menu disappears in 'full screen'. If this is all that is being needed, then why doesn't Parallels just make the 'full screen' button use Modality mode, with the Window automatically sized to fill the screen on which this is selected, and the desktop menu turned off?. This would seem to give a mode to solve the current issues, while perhaps they work to find a better solution. In fact, 'generically', it'd be much nicer to have the Parallels Desktop menu, selectable as 'off', 'on', 'pop up' & 'pop up key'. The last would use a hotkey combination to display the desktop menu, which would also solve the problem in full screen mode, where this loves to pup 'down' when you are trying to access a menu near the top of the Windows screen. Would this work?