How do I change the Menu Music, Mission Music, and SFX options?

You can turn these features on or off by tapping the circled icon on the right of the respective option. If a green tick is shown, it means that the feature is on. 

Turning Menu Music off will mean that no music will play whilst on the menus. 

Turning Mission Music off will mean that no music will play during missions. 

Turning SFX off will mean that no sound effects will play throughout the game.