A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Hi Janey,
Thanks for posting in the community. We are happy to help you.
According to your description, you can't find the deleted notes in the desktop version of OneNote. Typically, this means that you haven't synced your changes from OneNote for iPad to the server before. To reconfirm it, please go to OneNote for Web (www.onenote.com), open the notebook in the browser, and check if you can see the deleted notes.
Also, generally, once you delete a section or a page, you can click the "Undo" button to undo the deletion operation in OneNote for iPad. If you haven't quit OneNote for iPad yet, please try undoing your changes.
If the above suggestions don't help, I am afraid that your notes have been lost. There is no way to recover these deleted notes.
Sorry for what you encountered. Appreciate your understanding and patience.
Sincerely,
George | Microsoft Community Moderator