Is your feature request related to a problem? Please describe.
When looking at your list of books, there is no indication what shelf a book is on.

Describe the solution you'd like
Add a column that indicates the shelf the book is on.

Describe alternatives you've considered
I know you can filter by shelf, but that's not what I am suggesting. Filtering does not tell me what shelf a book is on, except in a cumbersome way of filtering each shelf till I find the book.

Additional context

Apologies if this feature already exists. If it does exist, then it should be more prominent.