I'm using a couple of nice multi-level rails books, and I often get confused between the 2, 4 and 4:2:1, which are themselves within categorized books, and have to go back a level and choose the correct one, but my instinct to use the back button leads me to having to find and locate the main book in my main-level mess, and then the next category, and *then* select what I wanted.
It'd be a nice simple quality-of-life improvement

Regards,
qzjul