Do you have the document set to update styles from its template? Turn that setting off as follows: In the Templates and Add-Ins dialog box, clear the "Automatically update styles" option. Any subsequent changes made to styles/numbering options should now be preserved.
To display the dialog box: First show the Developer tab by selecting it at File tab | Options | Customize the Ribbon. On the Developer tab, click Document Template.
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Stefan Blom
Microsoft Word MVP
Microsoft 365 apps for business
Windows 11 Professional
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