Update: Sea of Thieves’ latest patch is now available for download for PC and Xbox One players, adding the ability to choose private or open pirate crews.
Sea of Thieves will now present players with two choices — Open Crews will allow players to assemble crews as they’re used, while the Closed Crews option lets a player start a game, which friends can then join when available.
Sea of Thieves Crews Options
This option prevents non-friends from joining. Any number of friends up to the limit on each ship can join a closed crew, with this option replacing the 3-player Galleon and Solo Sloop options.