After clicking on the 'Customers' link in the left hand menu under the heading 'Directory' I am given a page with various columns, including 'Open requests' and 'Closed requests'.

We've made a change recently which means the JQL query is no longer working, but I can't see any way to edit the queries for these 2 columns. Can anyone advise please?
I'd also like to know if I can edit what columns appear in this screen.