All of Toontown's game options are in your Shticker Book, under the top tab labeled OPTIONS. From here you can:
Turn music, sound effects, and type chat sounds on and off.
Decide if you want to accept requests for new Toontown friends.
Change display settings, such as screen resolution and toggle between full-screen and windowed view.
Change the color of your SpeedChat menu and speech text.
Use the Exit Toontown button to stop playing and exit the game.