The method comprises the following steps:

1. Open the WORD document to be operated, and click Page Layout in the toolbar.

2. Click Margins in the page layout.

3. Then select Custom Margin.

4. Enter the values to be adjusted in the top and bottom margins. (You can modify it many times until you are satisfied)

5. Back to the main document, I found that the distance between the horizontal line and the text in the header and footer of word has been adjusted successfully.