Lenovo IdeaPad Y550P User Manual page 18

Chapter 2. Using Your Computer
Gestures
The touch pad can recognize some gestures and make actions like zoom
in/out, or scroll up/down easily.
Pinch
Use two fingers and make a pinch gesture on the touch pad to zoom out;
reverse the gesture to zoom in.
Palm Check
To prevent mis-touch, the touch pad ignores big active area motions, like
any movement at the touch pad with your palm, you may set the area size
by "Synaptics Pointing Device" in the lower right corner of the desktop.
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