Support for dragging individual document windows out of the main Inventor window and onto a second monitor was added in 2019. This was a great step in the right direction. However, it doesn't quite meet all of our multitasking needs because the secondary windows are just the graphics canvas area; they don't include the Browser, the Ribbon toolbar, or anything else.
So, the next step to make multi-window even better for multitasking would be to add a dedicated Browser and Ribbon toolbar to secondary Inventor windows. There's already an idea created for that here: Inventor model tree and ribbon on second monitor.
The purpose of this idea, however, is to flesh out the multi-window experience even further. I would like for secondary Inventor windows to be fully functional: not just have their own Browser and Ribbon toolbar, but also have their own BOM window, Parameters window, Property Panel, etc. This way we can really truly multitask, and view the BOM, parameters, features, etc. for two parts or assemblies side-by-side, at the same time, and even copy and paste between them. This would fully round out the multi-window experience and maximize our productivity.