How to enable Chaos

This worked for me! Well, kind of. So everything is loaded, Chaos Solver is in the scene by default, I can create geometry collections, I can fracture, etc. etc. BUT… the geometry collections just seem to be stuck in space… they have no collision, no gravity, no mass. Also, in the video by @ at GDC, there seemed to be a slider in the fracture menu that let you preview pulling the fracture apart… as far as I can tell that’s not in the preview.

Anyone know how to get Chaos Destruction working?? I’d be perfectly happy to start by just seeing a cube fall from the sky and break apart when it hits the ground.