Currently there is no way to filter the results list.  You have to go through the pagination.  That being said, some sort of filtering capability is on the roadmap.
I was trying to add users in access zone through GUI.There are thousands of users in domain,every time the GUI displays only 50 at a time,we need to keep on asking it show more and more.It is easier to do in CLI, still wanted to know is there a way to list all the users or shares without asking more and more in GUI
Listing the users or shares in Isilon GUI