Classification Inbox

I am trying to manually classify some of my documents via the classification inbox, but I am running into a restriction. When I choose a structure from the drop down list of documents I wish to classify I get the following message at the bottom of the page:

<b>Category "Documents To Classify" contains 596 documents

Number of documents is restricted to 100

You have permissions for 100 documents here</b>

I want to remove this limitation of only displaying 100 documents. Does anyone know how to accomplish this?

Thanks