See [wiki:BOOK_WINDOW Book Window]. [[BR]]

Define extension points. [[BR]]

Below the book title bar is the book itself, where the book's selected page is presented. [[BR]]

The book can be resizible and has vertical and/or horizontal scroll bars when the book's page become bigger than the book window.[[BR]]

Dragging the edges or corners of a Sophie book window changes the window size. All edges and corners possess this behavior.[[BR]]

The X and Y fields in the bottom left corner show the value and can be manually changed.