I have a group named PASSENGER and I would like to make Keybinding 2 under Rules pull from that mount pool. I had this setup for ages (since like BFA I think) but I had to do a fresh install and can't recall how to do it. I tried looking up the Advanced Options guide, but when I originaly set this up there was an example I could copy-paste and then just change 1-2 things - so not sure how to do it myself.

I would probably make a rule like this: