This Zoom forum thread about being able to story gallery view provides a fascinating look into the many people, from teachers to dancers to actors to game developers, for whom this feature would be a big improvement.

I noticed that, after a recent update, my Zoom did, indeed, allow me to drag people around gallery view; what I didn’t know is that if the host does this, then the order can be deployed for everyone:

Your custom order will be seen only by you, or the host can deploy their custom view to all participants. This order can be released and the order will revert to the default.