Open Multiple Application Windows

I am trying to use the Open Multiple Application Windows in my setup (OpenRoads Designer). It is opening another window, but it's completely empty, no ribbon or anything, just grey. The help section says: "If on, you can move the view windows between different screens, by selecting Change Screen from the view window's control menu." but I can't seem to find the "view window's control menu". Is that supposed to be the toolbar at the top of the view window? If so, I don't see a button for "Change Screen".