A setting in preferences that when you breakout a tab the user can set it to automatically just give you a viewer of the tab (as is the default and only option at this time) or a full new instance of Bluebeam (akin to Foxit PDF Editor).
@dconnell, The current workaround is to manually open another instance of Bluebeam and open that document into the second interface.
Also, just to clarify, when you break out a tab it is not just a viewer. All tools and features remain active. You can still work normally in that window.
If what you are looking for is the full interface experience on the second screen, including all panels and controls laid out independently, then opening a second instance of Bluebeam is the way to achieve that.