LG K20 Plus User Manual page 27

Swiping
Touch the screen with your finger and move it quickly without
pausing. You can use this gesture to scroll through a list, a web page,
photos, screens, and more.
Pinching and spreading
Pinch two fingers to zoom out such as on a photo or map. To zoom in,
spread your fingers apart.
Do not expose the touch screen to excessive physical shock. You
might damage the touch sensor.
Basic Functions 26