All,
As a NEW explorer of AC21, I would like this functionality too. My current platform, Chief Architect X10 for Windows, does allow you to detach a view and drag it to a separate monitor. I am using 3 24" 1920 x 1080 ASUS monitors in Extended mode so my desktop spans all three plus the 17" Laptop running the system. The laptop sits on a desk away from my triple screen arrangement with a separate Keyboard, Mouse, and 3D Connexion Space mouse giving me a virtual workstation that is awesome. Chief works great in this configuration, as does Vectorworks 2018 but both REVIT 2018 and Archicad require I stretch the work screen across in order to maintain full view of each view port open. It works but is not ideal in comparison to Chief and Vectorworks. So for Revit and AC21 I use two of the three (Center and Right) and the third (Left) for the Navigation, and other tabs that are currently undockable on the windows platform. I do hope AC21 releases an update soon with TRUE multi-monitor for the Windows platform. If not, Vectorworks is taking the lead.
Thanks,
SIDG