This update for 1.20+ adds an optional feature which displays the books in a chiseled bookshelf if the player is sneaking and left-clicking a chiseled bookshelf (Works for signed books, book and quill, enchanted books and plain books). As this feature relies on chiseled bookshelves, this version is not compatible with pre-1.20 versions of Minecraft. Use 1.3.3 instead until you update.

The feature requires the bookswithoutborders.peekbookshelf permission, which is included in
bookswithoutborders.use.

Sign code has also been updated to only consider the front of a sign.