Firstly, ask a mod to move the thread. The Kobo Tablet area is for the Android based LCD-screened devices that Kobo had for a few years. The main area of the Kobo forum is for the e-ink devices.
For your problem, the first thing I would do is turn the brightness down. It is easily adjustable for most conditions. I had no problem reading in the dark with my Aura ONE.
But, if what you want is a reverse video mode, then do a search in the forum. There are two methods that should work.
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