Foliate looks fine, to my eyes, but I'm not sure what parts of it you dislike, so I'm limited in recommendations. Bookworm, perhaps? https://www.flathub.org/a

Foliate looks fine, to my eyes, but I'm not sure what parts of it you dislike, so I'm limited in recommendations. Bookworm, perhaps? https://www.flathub.org/apps/details/com.github.babluboy.bookworm https://www.flathub.org/apps/details/com.github.babluboy.boo...