I spent some time reading the source code and it seems that there is no court scheduling algorithm for round-robin and singe elimination. Swiss format is kinda doing it's own thing i.e. match scheduling has to be done manually (which make sense) but the button to schedule all match is not working for swiss format (which again, make sense).

Each format should have a scheduling algorithm associated with them. Round robin is either spread matches to all court or to custom court, same for single elimination. Swiss is a special case of scheduling because it kinda have to be manual, otherwise, that kinda become a round robin.

Is this something you were working on ?