This a a fairly minor issue, and I'm not sure if it is the reader or the formatting of the part, but on desktop I am reading in the two page spread view, but the illustration in v1p6 ~40% appears that it is supposed to be a two page spread, but it is rendering as a small image half the height of one page with a page of text on the side.
Also, the view selection button is somewhat unintuitive, there are 3 modes, a button is used to cycle through them, and the button displays a graphic and has alt text indicating what the next one is. This is a weird way to select multiple choices and I probably would have gone with 3 buttons with the current one highlighted or a drop down or something that makes it more obvious that there are 3 options and what they are.