Basic question - how do yo maximise the project window when you have a dual monitor set up.
It only seems to maximise to a single monitor? What am I missing?? 
you should be able to grab the side of the window and drag it to where you want it… 
Unless Cubase provides that facility separate from the OS, you will have to either:
a) Use a Cubase workspace to save the manual dimensioning.
b) If you have an AMD card, you can use Eye-finity to specify a virtual screen out of two or more monitors.
c) Use a third-party program that does that sort of function.
cheers guys, I normally stretch my project window across 2 monitors and have a workspace to bring up the mixer in the lower half of both screens. I always have this weird floating bar thing at the top of monitor 1. Its annoying because each window now has a border meaning I lose screen real estate. 
I hate this also !!
Agree as aboe.
I really wish we had an option to go back as it was. I see no need for docking or for for having changed the way windows behave.