To hide the books in your library from other users:
1. Log in to your account on bookmate.com.
2. Click on "My books".
3. Hover the cursor over the book cover and click on the arrow next to "Read" icon.
4. Select "Read in private".
If you want to hide several books, you'll have to do the same for each book.
Once a book is hidden, other readers won’t be able to see it in your library, nor they will be able to see quotes or notes which you will add while reading it.