Select a few books in the list and then right click > edit metadata > Download metadata and covers. (If for some reason it's missing go to Preferences (Ctrl+P) > Toolbars and Menus > Context Menu for Books in Library and add the Edit Metadata there.) It should grab you some descriptions or sometimes reviews. Then you can view them in the book details.
I suggest using Review Metadata in the rare case it tries to grab the wrong book.
Calibre has a few metadata plugins included already but you can get more by going to Preferences > Plugins > Get new plugins.
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