If Ctrl+Z is not restoring the erased content in the Note app and there is no built‑in version history or backup, there is no supported way in the provided documentation to recover that text.
For Microsoft apps such as OneNote and Office desktop apps, the documented recovery options are:
- Immediate Undo (Ctrl+Z / Undo button)
Works only if the action is still in the undo history and hasn’t been cleared by closing the file/app or performing too many subsequent actions. - Notebook Recycle Bin / Deleted Notes (OneNote)
- OneNote keeps deleted pages/sections for 60 days in the Notebook Recycle Bin (History → Notebook Recycle Bin), where they can be restored.
- On Mac, deleted notes appear under Deleted Notes, where they can be restored or permanently deleted.
These options apply only to OneNote, not to the Windows Note app.
- Backups and Previous Versions (OneNote / OneDrive / SharePoint)
- OneNote desktop can restore from automatic backups via File → Info → Open Backups.
- Files stored in OneDrive/SharePoint can sometimes be restored from version history or from the OneDrive/SharePoint recycle bin, but this applies to supported file types and locations, not to the local Note app content.
Because the question is about the Windows Note app (not OneNote) and no backup/versioning mechanism for that app is documented in the provided material, there is no documented recovery path beyond Undo.
References:
- Undo, redo, or repeat an action
- Recover deleted notes
- Recover deleted notes in OneNote for Mac
- Delete a section from OneNote for Windows
- Some column from my OneNote completely disappeared while i was using it - Microsoft Q&A
- Unable to restore deleted files from C:OneDrive - Microsoft Q&A
- How do i retrieve lost data from the month before? - Microsoft Q&A
- OneDrive won't let me restore more than 1 file at a time - Microsoft Q&A
- How to avoid "automatic" behaviour in comments (replacement of "- " with indentation) - Microsoft Q&A