Samsung GALAXY S6 EDGE User Manual page 278

2. Tap Sounds and vibration
3. Tap Vibration intensity.
4. Use the sliders to set the intensity of vibration for:

Incoming call: The phone vibrates when receiving an incoming call.

Notifications: The phone vibrates when receiving notifications.

Vibration feedback: The phone vibrates when soft keys are tapped and for certain software
actions.
Settings
.
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