Using Interactive Build Order Guide

I used this once a while back and not since. It’s in my installed mods but I can’t recall how to actually use it! All my other mods work just by being checked. It doesn’t seem to be an AI you select. Can anyone clue me in please? Where do I go to select which build I want to practice and how do I load it etc?? Any help is appreciated.

NM…got it…it’s a custom scenario.