I'm having a frustrating problem where full screen mode is duplicating the projector output full screen on the main display. This manifests by ctrl-U showing the correct output on the projector... but that same output scaled up on the display/monitor. If I use ctrl-shift-t to show the test pattern, both the projector and monitor show "projector 1".
Windows is set to extend the display across both, and in desktop mode everything works as expected (UI on display 1, projector not showing anything unless I drag a window onto its space).
Device: Windows PC, Intel GPU. Display 1: Sony HDTV (HDMI), Display 2: Epson projector HDMI.