Changes to "set default formatting" appear in new paragraph, but vanish once I have closed and reopened scrivener

I somehow missed the information on this in the tutorial. For anyone who finds this because they are having the same problem, I won’t attempt to rehearse the fix here, because although I got it working, I’m not sure I completely understand it.

But if you do a search on “default formatting” in the tutorial, you’ll come up with a couple of sections which should help you out.