[Plug-In: AStickyPostOrderER] Un-Sort Posts

I have categories with up to 40 posts that are sorted and I only need the first 20 sorted. How can I remove the rest of the posts from the sorted section?

I’m using wordpress version 3.0 and the plugin is up-to-date.

https://www.ads-software.com/extend/plugins/astickypostorderer/