@ngocle92dn you can swipe up on the lower right to get the "Recent Applications", select lights, adjust the lights, swipe up on lower right to get back to your book.
Ok, I know that's not the easiest.
A separate app to control lights is not the most convenient.
Does your reader application have a control for brightness?
One of the plans for my application was for it to monitor for attempts to change "normal" brightness and have it modify the correct variable color frontlight.
My own personal reader has all the guts of the Lights application built in so that I can change the backlight directly from my reading.
The other thing would be modify the Onyx framework to replace the sliders in the pull-down with brightness/color ones.
But you need root for that.
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