User's Manual

Page 14
 In addition to the Plus-Minus keys, you
can use the pinch and zoom gesture to
adjust the zoom level. Decrease the
distance between 2 fingers to zoom
out, and increase the distance to
zoom in:
 In addition to changing the contrast from
the Settings, you can toggle between
color, positive, and negative contrasts
by swiping on the right edge of the
touchscreen: