Huawei Mate 8 - Manual (Page 41)

First use and initial setup
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Smart screenshot: Knock twice on the screen using your knuckle to capture the screen
in full, or capture part of the screen by using your knuckle to draw a closed shape on
the screen. Knock twice on the screen using two knuckles to start or stop screen
recording.
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Draw: Use your knuckle to draw a letter on the screen and launch a predefined app.
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Dual windows gesture: Use your knuckle to draw a straight line across the screen and
enable dual windows.
Navigation bar
Open Settings, and then touch Smart assistance > Navigation bar to configure the
navigation bar.