I'm going to have to risk a 'snarky' answer (as described on another thread today).
Quite often I try to page my Logos iOS app vertically (instead of horizontally). It pops up a little window which on the top line has back and forward arrows, with the page number in between.
Having gotten really tired of that popup, I decided to check into lemonaide; maybe the arrows do something.
Sometimes they're grey'd out. Sometimes one is, the other isn't. I thought maybe next page, favorite, highlight, what? I seemed like it might be the maximum progress until the maximum progress got grey'd out too. I tried clicking one and then the other, to warn of an approaching train.
Ok, what's the obvious answer, so I can be properly embarrassed?