I’m told that earlier versions of Scrivener had an option, Edit/Transformations/Title Case that converted text to “title case” — capitalizing some words, not others, in the standard way applied to book titles. I can’t find that in Scrivener 3.
Did you intend to eliminate it? Am I looking in all the wrong places?
Yes, title case exists, but not in Scrivener as a transformation, and not in CSS as linked above (it can only do capitalisation, just as Scrivener can).
Pages can do title case pretty well, so if you have a lot of text to transform, a copy and paste round trip to and from Pages can be helpful.