Open the steam edition, alt tab to another application, alt tab back to the steam edition and then it seems to create a new window.

Also can you make the zoom changeable in the steam edition? The interface is quite small and it is a bit hard to read at the zoom level it is stuck on, it used to be able to zoom out but not zoom in, that was fixed so you can't zoom at all but I would prefer it if you could just freely zoom in either direction.