There is “Bury interday siblings” and “Interday/review order” which relates to interday learning cards.
I think with more people using FSRS, it might be worthwhile to consider hiding these option for users with current (re)learning steps <1d. It also gives a “slightly cleaner” look to the default screen.
I think “Interday learning” depends on your steps. How can it be otherwise? The options relate to learning cards with 1d or greater interval. The actual delay doesn’t matter.
That’s not quite correct. A card is an interday learning card whenever its current step crosses the day boundary. So those options also apply to a card that starts a 30m step when there is only 15m left before the next-day-starts time.