Three-finger screenshot and more, by using Quick gestures.
Go to [Settings] - [ Buttons & gestures] - [Quick gestures] to set your preferences.
System gestures
1. Flip to mute: Flip the phone to mute when there is an incoming call.
2. Three-finger screenshot: Take a screenshot by swiping down with three fingers.
3. Raise to answer/switch: Answer calls by raising the phone to your ear when there is an incoming call.
4. Enable one-handed mode: Use and control your phone with one hand by swiping down along the left or right edge to pull the whole screen down.
Screen off gestures
1. Double tap to wake: Enable this to tap the screen twice to wake up the device.
2. Music control: Enable this to draw II with two fingers to play or pause music, draw < or > for previous or next track.
3. Draw O / Draw V / Draw S / Draw M / Draw W /:
These can be set as None, open camera, open the front camera, record a video, turn on/off the flashlight, open shelf and open apps that you select.