Multiple panel in same space when mirroring display

I normally use two displays side-by-side so, I've put a panel on primary output (eDP-1), another one on HDMI-2, but when presenting in class using a projector, I mirror display, the issue is both panel on hdmi-2 and edp-1 appears in the same place.

I think the better option would be only showing panels from primary output if the display is mirrored.