Hi, I'm Roberta, a Microsoft Advisor and I'm here to help and assist you!
Did you try to repair Onenote?
https://support.office.com/en-us/article/Repair...
Hope this helps!
Thank you
Sorry that is an inapropriate and off-topic answer.
Please don't do an Office repair, it's the wrong app suite. OneNote is no longer part of Office 2019, so repairing Office will have no impact on OneNote.
The question relates to the OneNote APP.! (and not Miocrosoft Office OneNote 2016.)
The current Office (2019/365) no longer has OneNote as part of the package.
We are all having to struggle with the store app and it's inadequacies. We ignored it before because the Office application was so much more reliable and versatile.