Magnification gestures allow you to zoom in on parts of the screen by tapping an area of
the touchscreen three times in succession.
To Enable or Disable Magnification Gestures
From your Homescreen, tap .
Find and tap
Settings > Accessibility > Magnification gestures.
Tap the on-off switch.
To Magnify an Area and Pan Across the Screen
Magnification gestures is enabled.
Tap an area three times, and then hold and drag your finger across the screen.