If you're the creator of the world you're playing on, you can access the Server Settings to determine who can and can't play with you by blocking or kicking users.
Accessing Server Settings
- Enter your world
- Hit ESC to open the Menu
- Navigate to the SERVER tab
You'll see a list of all the players in your world, players that you've kicked and players that you've banned.
Kick or ban a player
- Click the player you want to kick/ban from the users in the Game table to select them
- Hit Kick/Ban, depending on which action you want to take
You'll then see the player reflected in either the Kicked Users or Banned Users table, depending on which action you took.
Unkick or unban a player
- Click the player you want to restore from the users in the Kicked Users or Banned Users table
- Hit UnKick/UnBan, depending on which action you want to take