How can I Display 'Items per page' in pager instead of the exposed form I want to show 'Items per page' bellow the pager, I found viewsxtras, but it's just a placeholder and does not contain any code.

I'm using drupal 7 and views 3.x.
How can I do this?
In Drupal 7 under PAGER click on "Paged, xx items", then look at the Pager options window