Scoreholio lets you change pretty much anything you’d expect to be able to change mid tournament. You can change the number of games in a round robin, number of courts, point cap, time limit, and even method of ranking participants, i.e. “record then points” or just “total points.” If you’re running a round robin or Switcholio event you can even add participants after you’re underway.
When you go into organizer options and see your tournaments, click or swipe to access the “Edit” screen for a given event. You’ll basically see the same screen you used to create and configure your event in the first place.