Through "Bookmarks Window",you can re-organize articles and organize articles in different books together. (similarly to "Favorite Folder" in the browser)
 
 

Context menu

New folder
Create a new bookmark folder
Rename
Rename the current bookmark
Delete
Delete the bookmark
Sort by Name
Sort bookmarks by bookmarks names
Move up
Move the bookmark up
Move down
Move the bookmark down

Notice

Bookmarks will be disabled in case that OS are re-installed or the computer is changed.