Dell Inspiron 1750 (Mid 2009) - Manual (Page 27)

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Using Your Inspiron Laptop
Zoom
Allows you to increase or decrease the
magnification of the screen content. The
zoom feature includes:
One finger zoom – Allows you to zoom in
or out.
To zoom in:
Move a finger up in the zoom
zone (extreme left of the touch
pad) to zoom in.
To zoom out:
Move a finger down in the
zoom zone (extreme left of the
touch pad) to zoom out.
Pinch – Allows you to zoom in or zoom out
by moving two fingers apart or bringing them
closer together on the touch pad.
To zoom in:
Move two fingers apart to
enlarge the view of the active
window.
To zoom out:
Move two fingers close
together to reduce the view of
the active window.