[noob] Geometry Mode Won't Work 3rd person template? How to use Geometry mode?

As title says, when I create a new 3rd person template, i can’t use the geometry editor like i can with in FPS template (like in I can’t select any sides to adjest. Is there some key or button I’m missing?

When I create boxes, they’re called StaticMeshActors, not brushes. I think that might be the root of the problem.

thanks for reading