I am working on a fairly busy assembly of a machine. On other CAD programs that I use, I usually have the main assembly on one monitor while working on single part or sub-assemblies on the other. Keeping one eye on the big picture and one on the little helps move design work along much more efficiently. In Fusion 360, this does not seem possible. I can open a second instance of F360 but interactivity is disabled which defeats the purpose. Using tabs in a single window is less efficient; for instance, measuring positions of geometry on parts within the main assembly - the inspection window remains open where data can be referenced easily. Tabbing across many parts or sub-assemblies it's easy to forget the information you just looked at. If one monitor could be used to show that main assembly, the other could be used to work on subs or parts without loosing sight of the main.
Would be nice to see duel use monitor capability in the next version of F360..