Restricted Ticket Mode (also called Simple Mode) is a feature that could be used to minimize the opening time for a ticket. If Restricted Ticket Mode is in use only most common and important data for the ticket will be loaded in the first step, e g basic data for Ticket and Requester, and the Comment stream. Comments could be added in Restricted Ticket Mode, but if other ticket data should be edited or handled, e g Linked Tickets or CIs, Tasks, Worklogs or Merged Tickets, you need to select Edit, in Restricted Ticket Mode form to open Edit Mode (Advanced Mode).
•Disable Restricted Ticket Mode (open ticket directly in Edit Mode): If checked, full Edit Mode will be opened directly when you click a ticket in Dashboard or a Ticket View.