In the new version of Toornament, there is a distinction to be made between the Anticipated Size of your tournament, and its number of participants.
You can change both, but they’re not the same thing.
First, as the name states,the Anticipated Size is the number of participants you’re expecting, and is only an indicative number, used as a reference and displayed on the information public page of your tournament. It can be changed at will in the General Settings of your tournament.
This value can range from 2 to 256. If you need more than 256 participants in your tournament, contact us at email@example.com and we’ll see it through!
The second size you will encounter is the Size of a Stage. Here, the limit varies, and it changes the stage accordingly to accommodate for said number of participants. You’ll be asked a size every time you create a new stage, and can edit a stage to change its size.
That is how you effectively change the size of your tournament, by changing the size of its structures.
Be careful though, as changing the size of a structure will re-generate it, thus resetting all its matches! Maybe adding a new phase is the way to go, depending on your situation!