GW Instek GDS-200 Series Quick start guide - Manual (Page 13)

Vertical Scale
Pinch in/out vertically to set the vertical scale of the
selected waveform.
Scale Indicator
Vertical Scale
Horizontal Position and Scale
Swipe the screen horizontally to set the horizontal
position of the displayed waveforms.
Pinch in/out horizontally to set the horizontal scale of
the display.
Horizontal
position indicator
Horizontal Position
Horizontal
indicator
Horizontal
Scale