The formatting of the footnote reference number is determined by the Footnote Reference character style. You can reapply that style to all footnotes, as follows:

1. Press Ctrl+H to display the Find and Replace dialog box.

2. For "Find what," specify ^f

3. Click in the "Replace with" box, but don't type anything.

4. Click the Format button, and then click Style. Select Footnote Reference and click OK.

5. Click Replace All.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional