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To rename a OneNote notebook and sync the change across all devices, you’ll need to do it in OneDrive online.
- In any web browser, go to https://onedrive.live.com/ and sign in with your Microsoft account.
- Open the Documents folder, locate your OneNote notebooks, right-click the notebook you want to rename, and select Rename.
- After renaming, open the OneNote desktop app on your Windows PC. Right-click the notebook and select Close this Notebook that you renamed.
- Then go to File > Open. The notebook with the new name should appear there under the Notebooks section. Click it to reopen and resync it in OneNote.
Once this is done, the new notebook name will sync across all your devices that use the OneNote app.