Huawei Mate 8 - Manual (Page 11)

Phone manager
Touch .
You can quickly scan your phone
for potential risks with one touch.
Follow the onscreen instructions
to use one-touch optimization, or
manually clean the system storage
and manage your applications.
Touch the options on the screen
to clean your system trash, set the
harassment filter, activate power
saving mode, manage your
applications' notification
permissions, and more.