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Hello,greycommotion
Welcome to the Microsoft community!
I have realized that your issue about the UI of your OneNote.
Your current Microsoft 365 is the latest version, the version number is already 2410.
I've detected that the current OneNote UI is indeed tweaked and has no options for modification or customization.
As far as for the current situation, there are only two temporary solutions, one is to display the notebook catalog on the left side, and the other is to roll back the Office version.
You can choose to set the navigation bar by clicking File > Options > Display in the upper left corner. Not sure it's possible to modify it as expected after the UI has changed though.
Search for "CMD" in the search box in the bottom left corner and run the command prompt as administrator.
cd %programfiles% \Common Files\microsoft shared\ClickToRun
Press Enter when you are done typing and type on the next line
For example: Oct 15, 2024, version 2409 (Build 18025.20160)
Officec2rclient.exe /update user updatetoversion=16.0.18025.20160
If you're Microsoft 365, you can check this connection
Update history for Microsoft 365 Apps (listed by date) - Office release notes | Microsoft Learn
This issue need the development team to further improve the product's functionality. Thank you for your careful observation and suggestions, your ideas and suggestions are crucial to improving Microsoft products, but this forum is mainly a technical communication platform, the Microsoft development team will not pay attention to this forum.
How do I give feedback on Microsoft 365? - Microsoft Support
Feel free to post back if you need further assistance.
Thank you for your understanding and patience and I look forward to hearing from you.
Ryan - MSFT | Microsoft Community Support Specialist