Huawei P9 Lite - Manual (Page 70)

Tips and Tricks
63
Adjusting the system volume rapidly
Press the volume button on the side of the phone, and then touch to adjust the
ringtone, multimedia, alarm, and call volume.
Using the floating dock
The floating dock gives you access to a number of frequently-used options and features,
such as the back key, home key, and one-touch optimization. You can move the floating
dock around the screen for easy one-hand use.
Under Settings, select Smart assistance > Floating dock, and then turn on the Floating
dock switch.