Currently, the vertical list of section tabs cannot be alphabetized. I have lots of tabs, and the apparently random way they are arranged currently is not helpful - it takes too long to find the section I want to use. Please add a way to alphabetize sections.
In addition, while manually alphabetizing I discovered that the section(s) assigned at the top of the list are assigned - again seemingly somewhat randomly - as tabs across the top of my OneNote window. Now I have a list of tabs across the top that I may or may not want easy access to without selecting the list - not useful. Instead, please allow section titles to be "pinned" as tabs at the top so they always appear there, but also appear in the alphabetized section list in their order. Pinned sections should be marked with a pin ...
Finally, the list of sections tabbed across the top don't also appear in the vertical section list, which makes it difficult to sort them.
Please think about how humans organize things and redesign the sections system to make it easy, rather than forcing us into whatever scheme (or lack of scheme) is currently in use.