At the top of the Outing Organizer in a multi-round event you'll see Round Played with a circle for each round. This is not to track when a round is finished being set up.
Instead, it's your way to lock the scoring in for a round that has been played. It affects what golfers can do and what settings you can change.
Key scoring settings lock on the Event tab for completed rounds:
You'll see a warning if you try to change locked settings: "Round 1 has been completed, and as a result, key scoring settings are now locked."
Changing scoring settings after scores have been entered can compromise scoring accuracy. Only unlock if you genuinely need to fix a configuration error.