Games can be public or private. As the game organizer you can control the game's privacy settings as follows:
Game Search Visibility
By default, your game will show up in the app's search results displaying the game title, description, and game image. However, you can adjust this via the Game Settings menu (gear shaped icon found in the bottom left corner of the game manager). Select Search Visibility to adjust this setting.
You have the ability to choose if you'd like to put a password on your game to make it private, or if you'd like to leave it open for anyone to join! You'll be able to add a password on the "Game Info" tab of the Game Manager. Participants must enter this password in order to join the game.