Capture an image of your screen. Your device will automatically create a Screenshots album in the Gallery app.
◌ From any screen, press and release the Side and Volume down keys.
Capture an image of the screen by swiping the edge of your hand across it, from side to side, keeping in contact with the screen.
1. From Settings, tap Advanced features > Motions and gestures > Palm swipe to capture.
2. Tap to enable this feature.
from pages 73-74 in User Guide