[otrs] disable Pending date field

Hi, How to disable the Pending date in the page to add Note, I want to have the same fields that in the demo : http://demo.otrs.org/otrs/index.pl?Action=AgentTicketNote&TicketID=116827 But I have three fields more ("Pending date", "state" and "priority"), how to disable them ? I have change something in sysconfig, but I've forget what :( Thank you, Samuel.