Enter Settings-Battery-Select "Power Saving Mode/Low Power Consumption Mode"; You can also slide down/up at the top of the screen to bring up the control center and find the power saving mode to open.
Note: When the low/power saving mode is turned on, the battery icon in the status bar will turn yellow.
Enter Settings-Battery-More Settings/icon in the upper right corner-Turn on the dark mode at the same time-Turn on the function. Turn on power saving mode and turn on dark mode at the same time. (If this switch is not available, it means that this model is not supported. )
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.