I don't know what calibre uses for case shifting (home grown or open source library) but it offers both, pretty sure they do as AlanHK would have them do.
But why not call it
Capital case
FWIW : In a ToC I would shift "CHAPTER XI—FINDS PRINT OF MAN’S FOOT ON THE SAND" to "Chapter XI—Finds print of man’s foot on the sand" - i.e. Sentence case.
BR