Huawei Mate 9 - Manual (Page 194)

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Browse a magnified area: Swipe the screen using two fingers.
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Adjust the zoom: To zoom in, spread your fingers apart on the screen. To zoom out, pinch
two or more fingers together on the screen.
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Zoom in temporarily: Touch the screen three times in quick succession, and then hold
your finger on the screen. Swipe to browse a magnified area. Release your finger to zoom
back out.
System Features and Settings
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