In 3D view, right-click, select Options > Display > Untick 3D bodies.
There are a few other ways too but that is probably most convienient to show/hide all.
Thanks for that tip. One more related question. Is there a way to hide individual 3D Bodies when working with variants? I guess I need to go read up on Variants and what that's all about but figured I'd ask here as well since it's related.
I'm running DRC checks and some of the errors fall under 3D Parts. I know I can see the errors in 2D but I would also like to see them in 3D because sometimes they jump out at me more than in the 2D view. So, how can I view my board with no 3D Models. I tried the Show Hidden feature and it seems to only apply to simple bodies. Most of my parts are Step models.