In the last release or so, macOS changed Edit > Transformations > Make Title Case to Capitalize, which is I think a more accurate term for what it does. It would be nice if Scrivener followed suit.
My idea of title case is “April is the Cruellest Month” whereas capitalize would be “April Is The Cruellest Month”.
Maybe Scrivener could harness its Linguistic Focus thingy to figure out “title case” in this sense, and then have both Capitalize and Make Title Case?