1, open a Word document, as shown in the figure below:
2. Select a blank position in a suitable position, hold down the left mouse button and drag, as shown in the figure below:
3. Select the underlined U at the top, as shown in the following figure:
4. The position becomes a horizontal line, as shown in the figure below:
5. Another method is to select Insert, as shown in the following figure:
6. Select the lines in the shape, as shown in the following figure:
7. Hold down shift in a proper position and draw a line, and a horizontal line will appear, as shown in the following figure: