OneNote Navigation Notebooks, Sections, Pages

Hi,

Using OneNote

Version 2109
Build 14420.20004
Beta Channel

Seems in this article

https://www.microsoft.com/en-us/microsoft-365/blog/2017/05/18/note-taking-made-easier-for-everyone-redesigning-onenote/

I should see a left pane navigation experience for Notebooks | Sections | Pages

But I still see section tabs across the top - Garish!

Is there something I need to to to enable all navigation at the left and remove the Section Tabs across the top?

Thanks,

-w