Description of your request or bug report:
When I’m browsing around in Natively and looking at a book page, I often find myself wondering “hmm, what else does Natively have at this level”? At the moment to do that you have to remember the level number and then navigate to the search and fill in the filter with level numbers, which is pretty cumbersome.
The instinctive thing I do in this situation is click on the “level nn” tag – even though I know it doesn’t do this, I keep subconsciously expecting that it ought to go to a page for “level nn books”. So my UI suggestion is to add a “show other books at this level link” to the popup you get now.
Possibly the link should show you also books at a level up/down from the exact level? I’m not sure about what would be most helpful/interesting to see.