Solid start. The page layout options could use a bit more work:
1. It initially defaults to showing two facing pages per screen, but the selector shows "Read a chapter as a long scrolled page" as selected. "Fit 2 page side by side in window" is the same and is presumably the actual default. Switching back to "long scrolled page" from that does do what you'd expect. This is fullscreen on a 1920x1080 desktop display.
2. I personally dislike side-by-side views - I find them distracting - but at this size the line length for "long scrolled page" is too long for readability. I'd prefer a "long scrolled page but with shorter lines and bigger margins" option, like Firefox's reader view.
1. It initially defaults to showing two facing pages per screen, but the selector shows "Read a chapter as a long scrolled page" as selected. "Fit 2 page side by side in window" is the same and is presumably the actual default. Switching back to "long scrolled page" from that does do what you'd expect. This is fullscreen on a 1920x1080 desktop display.
2. I personally dislike side-by-side views - I find them distracting - but at this size the line length for "long scrolled page" is too long for readability. I'd prefer a "long scrolled page but with shorter lines and bigger margins" option, like Firefox's reader view.