To be clear: the nightmode in KO2 inverts the screen so it's white text on black. It does not shift the light toward yellow / red like the kobo or as done on tablets with apps like f.lux.
If you want to simulate how it'll look like you can load the book I made (attached). With KO2's nightmode, the whole screen will be white on black and there won't be flashing on page turn. Other than that, this will be how it will look.
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