I need to verify that this works with your KTP panel model, but try this:
Select Scheduled Tasks and add a new task. Change to "Execute when the current user is changed" or "User Change".
Go to Properties > Events. Add "GetGroupNumber" and output to a PLC tag that can trigger logic to update another tag that will switch the screen.
You will need to have a structured user administration scheme to insure functions that depend on logged in user can be differentiated by group number.