Office Settings & Configuration

How to Restore the Missing Undo Button in OneNote Simplified Ribbon

Khadija Khan Oct 21, 2026 868 views

Question details

The user is unable to find the Undo button in OneNote's simplified ribbon, even though the Redo button is still visible, and standard resetting or reinstalling does not fix it.

How to Restore the Missing Undo Button in OneNote's Simplified Ribbon

Product: Microsoft OneNote
Device & OS: not provided
Scenario: Trying to undo an action using the quick access toolbar or simplified ribbon in OneNote.
Observed behavior: The Undo command is completely missing from the simplified ribbon layout, and resetting the ribbon or reinstalling the application does not restore it to its former position.

Before you start

Before modifying ribbon settings or reinstalling OneNote, manually sync all your open notebooks to OneDrive to prevent any accidental data loss.

Solution 1Recommended

Switch to the Expanded Ribbon Layout

Temporarily switching to the classic expanded ribbon is the most reliable way to access the Undo function while dealing with simplified layout bugs.

Microsoft 365 updates occasionally cause display anomalies in the Simplified Ribbon. Reverting to the Classic or Expanded ribbon forces the interface to display all standard commands, including the Undo button.

Access ribbon display options

Click the downward-pointing arrow (Ribbon Display Options) located in the bottom right corner of the OneNote ribbon.

Select the Classic Ribbon

From the dropdown menu, click on 'Classic Ribbon' or uncheck 'Simplified Ribbon' to expand the toolbar.

Locate the Undo button

Look for the curved left-pointing Undo arrow, which should now be visible on the Home tab or in your Quick Access Toolbar.

Keyboard Shortcut Alternative: You can always bypass the ribbon interface entirely by pressing Ctrl + Z (Windows) or Cmd + Z (Mac) to undo your last action.

Solution 2

Manually Add Undo to the Quick Access Toolbar

If the simplified ribbon is missing the Undo button, you can pin it to the very top of your application window for persistent access.

Solution 3

Update and Reinstall Microsoft 365

Software bugs in the interface can sometimes be resolved by applying the latest Office updates or performing a clean installation.

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Frequently Asked Questions

Why did the Undo button suddenly disappear from my OneNote simplified ribbon?

This is typically caused by a known software glitch in recent Microsoft 365 updates affecting the Simplified Ribbon layout. It can also happen if the ribbon customization settings were accidentally modified or reset.

Can I still undo actions if the button is missing?

Yes. You can use the universal keyboard shortcut Ctrl + Z (on Windows) or Cmd + Z (on Mac) to undo your last action, regardless of whether the button is visible on the ribbon.

Will I lose my notes if I reinstall OneNote to fix the missing Undo button?

You will not lose your notes as long as they are properly backed up. Always manually check that your notebooks are completely synchronized with OneDrive or SharePoint before uninstalling the application.

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