Click the [File] tab, [Options] button
The [Word Options] pop-up window will pop up, select [Proofreading] 】
Click [AutoCorrect Options] in [AutoCorrect Options]
Open the [AutoCorrect] menu Click the [Automatically apply formatting when typing] tab, in the [Automatically apply when typing] area, check the [Frame Line] checkbox and click the [OK] button to exit the automatic [AutoCorrect] dialog box
At this time, start inputting 3 or more (__ hyphens) in a blank paragraph in the document and press the Enter key to insert a horizontal straight line.
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