Can I show divisi in one layout but not in another?

Seems unlikely but it’s worth a shot…

In write mode, I would like the Full Score to not show the divisi (I know dorico can’t do condensed yet, so this would just show the top divisi line). But in a layout for that section, I would like to show all divisi lines. Is that possible? If so, how do I set it up?

I don’t think so (though I’d be happy to be proved wrong). I suspect you’d have to have a separate player that you exclude from one layout and show in the other layout.

No, there’s no way to show divisi in only one layout.