To reformat a document so that it matches the formatting of a (modified) template, create a new document based on the template and then import the existing content via the Insert File dialog box (Insert tab | Object | Text from File).
By the way, if you are trying to change numbering formatting by changing quick style sets, note that it will be unpredictable. When numbering is involved, using templates is the way to go.
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Stefan Blom
Microsoft Word MVP
Microsoft 365 apps for business
Windows 11 Professional
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