Title explains everything 
One of the peers acts as a server which has authority over the others. Usually that would be the person hosting the game.
Here’s a link to high level multiplayer docs - in one of the examples it shows how a peer creates a client and another creates a server. Clients then connect to the server peer. Server has authority always.
If you were to have a dedicated server for your game, all of the players would be just clients.
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