PowerPRO shows you your Screen Draining Status, for you to see if the screen brightness is using too much of your battery - and helps you change that.
To control the screen usage of your device’s battery, in the PowerPRO “Screen” tab, move the BRIGHTNESS button left or right. The more you move it to the left, the less it will drain your battery.
You can also choose one of the Screen Optimization status: NONE, LOW, HIGH and EXTREME. The first one does not optimize the screen, while the other ones lower the number of pixels on your device’s screen, reducing its battery usage.