one the three reading modes: basic, advanced, or music.
The first mode lets you conveniently read any book or document. The advanced mode is similar, but lets you carry out extra actions like taking notes and tweaking several different parameters. And the music mode lets you conveniently work with music scores.
The setup screen in Librera: Book Reader has options to change the visual theme to any of more than a half-dozen different schemes. You can customize the app interface as desired. Plus, once you're reading you can change the size of the font, zoom in and out, etc.
Librera: Book Reader is a terrific Android reading app that lets you enjoy books and comics in any format. One of the best options out there for people who love to read.