User manual

set your screen, the less blue light will be emitted from the display. When
you use the OPPO phone at night, you can turn on Night Shield to cut down
on eye strain and sleeplessness you might get.
6.6. Change auto-lock time
By default, your OPPO smartphone locks automatically after 30 seconds. To modify
this, alter the amount of time yourself.
Change auto-lock time. Go to [Settings] > [Display & Brightness] > [Auto Screen
off]. Options range from 15 seconds to 30 minutes.
Tip: The longer your display, the more the battery drains.
6.7. Change the font size
OPPO smartphone lets you change the font size to that of your eyesight needs.