Before PeopleTools 8.55 was released, Oracle announced that Fluid would be the default navigation. After setting up an 8.55 demo system, I wanted to play around and “kick the tires”. Well, Oracle is quite serious. There is no other navigation option for 8.55. In the past, you could choose between navigation options on the “PeopleTools Options” page.
Update 2/8/2016 – You can use the drop-down navigation style with PeopleTools 8.55. – Dan