First, select the title to select the style, and right-click to select Modify. Set the fonts of the first-level title, the second-level title and the third-level title, and take the first-level title as an example to set the font size, font and line spacing.

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Click reference > table of contents > insert table of contents > modify > modify in the menu bar to set the format of the table of contents, and pay attention to the left and right indentation.

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Click OK > "OK" > "OK ",and the directory has been generated.