So with the new windowing scheme you can now hide MixConsole and other objects which is -very- handy for working with external programs, eg. VSL, Hauptwerk, etc.
So there now needs to be a dedicated key command for show/hide of the Project Window. It should work -exactly- as do the kcs for MixConsole, Racks, Automation, VST Performance, etc.
It’s such an obvious thing, I gotta believe this was just an oversight.