1. Delete the directory title, open the Word document, switch to the reference menu, click Insert Directory under the directory, and adjust the display level in the directory settings from level 3 to level 2, so that the level 3 title will be cancelled. Click OK.

2. Modify the directory title according to the above method to enter the directory setting page, click Modify at the back of the option, select the directory whose title needs to be modified, click Modify, manually enter the modified name and font format, select the required data, and click OK.