How to set a Carde.io Riftbound tournament to 3 rounds instead of the default 4 rounds?

Ruling: The number of rounds in Carde.io is automatic based on player count, but there is a setting that allows you to control it (the specific location was found by the asker with help from a friend).

Nuances:

• If you have an even number of players, you can set all games in the final round to intentional draws without affecting standings
• This workaround does not work with an odd number of players, as the player with a bye gets a win which changes OPW% tiebreakers
• Alternatively, you can use the last real round's standings to determine prizing as needed