Removing 'All Requests' option from a user's layout template

I would like to be able to remove the 'All Requests' tab from a user's layout template. I am aware that you can restrict users to only view the requests they have submitted but I do not wish to do that as I want to allow users to view previous year requests from their team members. Once users go to 'All Requests', they can see everyone else's requests. I don't see why this tab cannot be removed.