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Select the File menu and select Options.
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On the Proofing menu, select AutoCorrect Options...
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Select the AutoFormat As You Type tab, clear Automatic numbered lists and select OK.
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On the Word tab, select Preferences and select
 AutoCorrect. -
Select Autoformat As You Type and clear the Automatic numbered lists check box.
Stopping auto numbering isn't currently possible in Word for the web. You can, however, stop autonumbering in the Word desktop app.
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To open the app, at the top of the ribbon, select Editing > Open in Desktop App.
Don't have the Word desktop app? Try or buy Microsoft 365.