- You will need to access the desktop version of OneNote and login to do this.
- Go to the notebook whose pages you deleted.
- Right-click on the notebook.
- Go to View Deleted Notes.
- Right-click on the page you wish to restore.
- Restore the notebook of your section.
- Sync your OneNote before closing the app on your PC.
- The page on your iPad has been restored.
Update:
Microsoft has moved the delete option. Instead of right-clicking, you have to go to the View Tab > Deleted Pages.