I just told my girlfriend that witches ride side-saddle (and that thus the ride would be more comfortable if you have some junk in the trunk). The Worst Witch books by Jill Murphy (UK) back me up on this.
She says that witches ride with one leg on each side, and Ottfried Preussler’s Die Kleine Hexe (Germany) backs her up!
Then again, in picture three here, die kleine Hexe is doing something different again. 🤔