But since the macOS menu bar is a reserved space, it does not make sense to let non-fullscreen windows slip below there. For full screen windows this is a different thing...
My main issue is not the windows taskbar, but the application that is running in the VM - and the reason for Parallels.
And the only reason for coherence mode in my case is:
if a Windows App opens the mac Mail thru Parallels in non-coherence mode, the Parallels window gets halfed in width and the Mail App is shown right of it (side-by-side) on the same screen.
In this case, the Windows App gets resized to the new screen width, and stays there also after the macOS Mail is closed and Parallels resized its own window (container) to the original width.
I was not able to disable that macOS Mail side-by-side behaviour, therefor I enabled coherence mode, which was better - but still not good (a choice between the devil and the deep blue sea).
Regarding your KB:
You may have noticed that even though Coherence view mode can now work with all Mac screen, Windows applications are still limited by Mac menubar and the Dock, i.e. even if maximized they do not go under Mac menubar and the Dock (if it is enabled).
It is done by defining a limited "working area" which prevents Windows applications from going under the Mac menubar and makes them behave just like Mac applications.
How do I define the "working area" in Parallels?
Is there a way to enable the old behaviour used in pre Parallels 9?
Thanks and best regards,
Martin