Just fire up the Blackmacig Design Video Hub software and connect to the IP address of your ATEM. Only works for the ATEM Mini range.
This will be awesome for users of ATEM’s with lots of AUX ports (Hello Constellation) if BMD add this functionality to the other ATEM’s.
Here is a screenshot of my ATEM Mini
You could also use any of the hardware router control panels!
Credit to Toby Eggitt who highlighted this capability on the BMD developer forum (and which I didn’t believe, but before slamming him for confusing Video Hub with ATEM, thought I better check using Putty, and glad I did)