You can access your books and audiobooks in the Books app > System Settings, click your name at the top of the sidebar, then click iCloud. Click iCloud Drive, click Apps Syncing to iCloud Drive, then turn on Books.
macOS 13–14.5: Choose Apple menu > System Settings, click your name at the top of the sidebar, then click iCloud. Click iCloud Drive, click Apps syncing to iCloud Drive, then select Books. Click Back, then click Done.
macOS 10.15–12.5: Choose Apple menu > System Preferences, then click Apple ID. Click iCloud in the sidebar, then select iCloud Drive. Click Options, then select Books.
macOS 10.14 or earlier: Choose Apple menu > System Preferences, then click iCloud. Select iCloud Drive, click Options, then select Books.
To see your collections, bookmarks, notes, and highlights on your Mac, open Books, then do one of the following:
macOS 13 or later: Choose Books > Settings, click General, then select “Collections, bookmarks, and highlights.”
macOS 12.5 or earlier: Choose Books > Preferences, click General, then select “Collections, bookmarks, and highlights.”