User manual
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3.1.3. Menu, Home and Return buttons
The traditional hardware buttons have been replaced with on-screen virtual
navigation keys which also offers fast and fluid gestures to operate your
phone. You can change the order of the virtual keys, and set them to appear
only when needed to free space on the screen.
Enable virtual navigation keys. Virtual navigation keys are default on. If you
want to enable them manually, go to [Settings] > [Smart &
Convenient] > [Navigation Keys] and click Virtual Key Navigation.