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Hi Gustav M,
Thank you for reaching out. My name is Leo, a user just like you. I'd be happy to help you with your concern.
I hope I have understood you correctly. You accidentally converted your OneNote table format to an Excel format and want to revert the changes back to the OneNote table format, am I right? If so, you can undo the changes if you haven't made any major changes after you accidentally converted it. To do that, click the Undo button (Curve arrow) in the Quick Access Toolbar to revert back the changes.
For more information regarding this issue, you can check the similar case on this link with a screenshot of the solution. Link:
https://answers.microsoft.com/thread/f2a7088b-5576-4415-8c81-7bcd0b426305
Your understanding and patience will be highly appreciated. I hope I provided a helpful information regarding your concern! Let me know if you have any further questions. Be safe always!
Best Regards,
Leo