How to Enable or Disable 3D Touch on your iPhone 6S
3D Touch introduces a completely new way with how you interact with your iPhone. Instead of just tap and gestures, the iPhone 6s and 6s Plus will also be capable of detecting how much pressure has been applied on the screen.
1. Launch the Settings app.
2. Navigate to General, Accessibility, 3D Touch.
3. Once inside the 3D Touch section you can switch 3D Touch ON or OFF.