1. First open the Word software, open the document to be set, and then click the Start tab.

2. Next, click the style of the ribbon and right-click the title 1 in the pop-up item.

3. Click Modify in the pop-up right-click menu to pop up the modified style.

4. In the Modify Style dialog box, click the Format button in the lower left corner.

5. Click the paragraph in the pop-up menu.

6. The paragraph dialog box pops up, and click the drop-down box behind the outline level to set the outline level to which the title 1 belongs.