Haptic Feedback is enabled when touching the front buttons (Menu, Back, and Home buttons) and it vibrates upon touching with variable strength and intensity. To enable/disable Haptic feedback for front touch buttons on LG G2, do as follows:
1. Open Settings and go to Sound tab
2. Under System settings, open Touch feedback & system.
3. To disable Haptic feedback, make sure to uncheck "Vibrate on touch"
4. To change the vibrate intensity (strength), go back and under Sound Profile, open Vibrate Strength. Now change the intensity for the Vibrate on Touch option
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