Change the # of Post to see in wp-admin/edit.php

Ok so I have almost 20,000 post in my blog…
Everytime Im gonna edit some I only get to see 1-15 and so on..

see edit.php only shows the first 15 posts…
What if I wanted to see 1000 post at a time?

Where do i change the post count in the edit.php?

thanks…