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.