Huawei Mate 8 - Manual (Page 207)

Accessibility features
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Touch the screen three times in quick succession and then hold your finger on the
screen to zoom in temporarily. Keep your finger on the screen and swipe to browse
a magnified area. Release your finger to zoom back out.
Using the power button to end a call
1
Open Settings.
2
Touch Advanced settings > Accessibility and then turn on the Power button ends call
switch.
Once you have enabled this feature, you can press the power button to end a call.
Adjusting the screen response time
You can adjust the time that it takes for your phone to respond to gestures, such as touch
and hold.