Scrolling Naviagation Bar feature is available for two Layouts:- Both Sided and One Sided.
Enable Scrolling Navigation bar from :-
Story Timeline >> Content >> Advanced Settings >> Naviagtion Bar
Post Timeline >> Content >> Advanced Settings >> Naviagtion Bar
Naviagtion Bar Styles:- Three different Styles of Navigation bar. Style 1, Style 2 and Style 3.
Navigation Bar Position:- Left or Right.
Click here to view Live Demos of Navigation bar.