Thanks for the reply. I just wanted MM shown on the secondary screen which is working already, going through the config.txt is useful if you need to get it to work or enable/disable it.

I stepped away for a sec and realized that the default mode uses the touchscreen as an extended display. So I simply need to move the window using electronOptions in the config file (do’h!).

I have a Raspberry Pi Official 7" touch screen working as an extended desktop display in addition to my HDMI monitor. How can I have MM run (only) on the 7" touch screen instead of my HDMI monitor?

It seems I should be able to write DISPLAY=1 or :1 (environment variable) somewhere and it should do the trick, but I haven’t found where.