Use the title 1, 2 to define each chapter of the text. It is convenient to define. Just point the cursor to "Chapter 1" and click the title 1 on the right with the left mouse button. Title 2 defines the same method and so on. The second and third chapters are also defined in this way until the end of the full text.
Title 1, attributes of title 2 (such as font size, center, bold, etc. ) you can modify it yourself. Modification method: right-click "Title 1" and select "Modify" to open a menu of modification, which you can modify according to your own requirements. You can also add a title, lower the triangle symbol to the left of the changed style, and then click Select Apply Style to create a new style.
When everything is defined, we can generate the directory. Move the cursor to the blank position where you want to insert the directory at the beginning of the article, select Quote], and click the directory.
Select the second tab [Automatic Catalog], and then click OK in the lower right corner. It doesn't matter.
When you modify the content of the article again, you need to update the table of contents. The method is: reference], click the directory, select the second tab [Automatic Directory], and then click OK at the bottom right.