If you want to change the defaults, you can do so in the Manage Styles dialog box. Create a new, blank document, for example by pressing Ctrl+N. In the Styles pane (Ctrl+Alt+Shift+S), click the Manage Styles button. On the Set Defaults tab, make the desired changes. Before clicking OK, select "New documents based on this template." If/when you are prompted to save the Normal template, choose to do so.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional