1. Open the related document whose title needs to be edited.

2. You need to select the text for which you want to set the title.

3. After opening related documents, start the menu bar through search.

You can see a button with a first-level title in the Start menu bar.

5. You need to click this first-level title button.

6. After clicking the first-level title, you can see that the text you selected has become the title setting.