[robinson]

Could you explain how to do that? That is, to create and switch between *two* *user-created* color themes?

It seems to have only one. After that, you can press the night mode button, but you have no control over its colors! It is always white text on black.

I have worked through ShuBooks' convoluted color setting scheme multiple times, but no matter what I come up with, you end up being able to set only one set of colors, not two.

This is dramatically different from what eReader and Stanza offered, which were real color themes-- e.g., you could create a Midnight Blue theme with blue text against a black background, along with a Midnight Gold, with yellow text, a daytime sepia, an afternoon parchment, etc.