One of the few features of OpenSong that I would value on Zionworx is the ability to work on a single screen for training purposes by having a small window that emulates the projector. This would allow operators to learn the features at home rather than having to use the real system.
I would envisage something along these lines:-
A menu option allows the operator to select "Preview" mode. This then generates a floating window, perhaps 1/5 the size of the screen, which displays exactly what would be displayed on the projector. Obviously it would need always to be on top, and would therefore obscure some of the control panel, but being moveable should make this a minor inconvenience.
NB - The existing operator panel in the lower centre of the screen actually shows the screen as it would appear if Background and Words are both selected, but it does not reflect the use of F10, F11 or F12, which is a trick the operator needs to be aware of in order to avoid panic in the service! Hence one use of having a floating Preview window.