How do I set up Civ 6 on multiple displays?

I have seen videos and posts talking about playing Civ 6 on three monitors, e.g. this Reddit post, pictures from that post, and this YouTube video. But I can’t seem to figure out how to make that happen on my equipment. I am on Win 10, Civ 6 Gathering Storm up to date.

My goal is probably even trickier. I am playing on a laptop with two outside monitors. I am hoping to play only on those two plugged in screens, but I guess I am still at the first hurtle: how to set up Civ 6 for multi-screen.