1. Slide down from the top of the screen/up from the bottom of the screen to bring up the control center, find "Eye Protection Mode/Global Eye Protection" and click Open;
2. Go to Settings-Display and Brightness-Turn on "Eye Protection Mode/Global Eye Protection" or set the activation period.
If you have more questions, you can go to official website /vivo Mall APP-My-Online Customer Service or vivo official website Web Edition-Slide to the End-Online Customer Service-Enter the manual customer service for consultation and understanding.