Acer Aspire ES 15 User Manual page 18

18 - Precision Touchpad
The precision touchpad includes added technology features that help
recognize and prevent unintentional gestures such as accidental taps,
gestures, and pointer movement.
Note
The touchpad is sensitive to finger movement; the lighter the touch, the better
the response. Please keep the touchpad and your fingers dry and clean.
Two-finger slide
Swiftly scroll through web pages, documents and playlists
by placing two fingers on the touchpad and moving both in
any direction.
Two-finger pinch
Zoom in and out of photos, maps and documents with a
simple finger-and-thumb gesture.