I have following setup:
A Mac mini 2011 with two displays - one on HDMI and on in Displayport. The HDMI display is connected to an HDMI Switcher which I use to connect different input devices to the HDMI display, like a RPi.
Every time I switch the input devices through the switcher away from the Mac mini, macOS deactivates dual display mode - all windows move to the DisplayPort display. When I switch back input to the Mac mini dual display support is re-activated and all windows move back.
Is there any way to change this behavior? I would like to keep dual display mode going on even after switching the display input. Is this possible?