VJzoo wrote:I'm sure it's a tick box some place
There is no such tick box.
If you have some spare performance you could to the mapping in a virtual screen, then use this virtual screen as the input of a single slice in screen 2 which you send to your output, and in screen 3 you have another slice with the same input and send this Screen to spout/syphon (or NDI).
Then from there either bring it back as source, or use an spout/syphon(/NDI) monitor app.
NDI is the one that requires the most resources.
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