This will show you how to display more posts per page in a thread, just something useful for you.
Go to User CP > Options
Go down to Thread Display Options
You will see Number of Posts to Show Per Page
Change it to Show 40 Posts Per Page to show the most posts per page.

Go to User CP > Options
Go down to Thread Display Options
You will see Number of Posts to Show Per Page
Change it to Show 40 Posts Per Page to show the most posts per page.
[SLIDE]http://i.imgur.com/FonKS.png[/SLIDE]