I have not seen any product screen images showing this feature. Can you imagine a more useful and focused way to work in cad on the Mac. I have feeling they do not support this since I see that they have used an non unified GUI for AutoCad Mac. Every GUI eliement (toolbar, command window, Menue bar) is a separate floating element surrounding the document window. I don't know why they went with this model based on the old OS9 from the 1990's. For a decade Apple has been using a unified window GUI for it;s apps and especially the Pro apps. Yes the windows OS is also using this.
A unified window is much better. A separate one requires you to manuall move each element to the the edge of screen and the enlarge the drawing window to fit between them. If you change from a notebook to large monitor it is not always automatic. Sometimes document windows can get tucked up under the tool or menu bars. At least that is what I experence in the separate gui of Archicad 14.
I hope they will move Autocad to a unified GUI Window for OXX!