Dell Inspiron 15 (M5030, Mid 2010) - Manual (Page 31)

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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 out:
Move a finger down in the zoom
zone (extreme left of the touch
pad).