Huawei Mate 9 - Manual (Page 47)

Drag the floating dock to move it to other parts of the screen.
Using the floating dock
Once enabled, the floating dock will be shown on all screens except the lock screen and
notification panel.
Touch to expand the floating dock menu. You can:
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Touch to return to the previous screen or exit the current app.
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Touch to return to the home screen.
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Touch to display the list of recently used apps.
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Touch to lock the screen.
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Touch to clean up the phone memory and close all apps running in the background.
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Touch to collapse the menu.
Screen and Display
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