How do I add a book from Apple Book Store to my Mac's Books.app (Catalina)?
Under macOS 10.15.1 (Catalina), from the Books app I can go to the Store, select a free book such as "The Swift Programming Language, Swift 5.1 Edition", and click the Read button to read it.
But how do I add it to my Books.app library? So that I don't have to keep going to the Book Store each time.
iMac 27", macOS 10.15