The interface of the villagers, on mobile devices, you can not see what enchantment the book has that the villager wants to sell. It is a very big bug that makes it difficult to trade with the villagers with a librarian profession.
MCPE-52099
Trade with librarians.
Resolved
Duplicate
1
You cannot see the book a villager is trading if you haven't unlocked the level yet. If your villager is currently level 1 and the book you want to get is at level 2, it will not show you the enchantment.