In the General Settings for MV Live, you can control the Sound FX, font size and Animations for your MV Live room to your liking.
To reach these settings, open a live room and click <Settings> at the bottom right.
This will open a menu. At the top of that menu click <General> and you will see the following options. Simply click the option to change your live experience:
Your visiting members will still see the room based on their own preferences so make sure to set up your live room in a way that works best for you!