I have LG G3, now running on Android Marshmallow. Prior to Marshmallow, I had this setting under Settings - Gestures. Now, I can't find it on Marshmallow.
Did LG remove it? If not, where is it?
The features are still there, LG only moved the settings to other place.
The gesture settings regarding calls have been moved to main phone
Settings - Call - scroll down to Gesture
For smart screen gesture, that setting is now listed under Display
Just found the answer to the "...by putting the phone to your ear" setting on my LG G3. It wasn't in the general settings. I opened the phone icon on the home screen and then opened the menu in the right hand corner → Call Settings. The options for answering the phone with the gestures were there.