The pages of a document can be rotated temporarily, as if you were rotating a book or magazine in your hands. This can be accessed by clicking on the Rotate View icons on the toolbar, or in View > Rotate [Counter-]Clockwise.
Note: This rotation will NOT be saved when the document is saved then reopened. To permanently rotate pages in the document when saved see Rotating Pages
Rotate View Clockwise: Rotates only the view within the document clockwise
Rotate View Counter Clockwise: Rotates only the view within the document counter clockwise