1, draw a line. Take a straight line as an example: click the left mouse button without releasing (set the starting point), and then drag the mouse to the appropriate position to release.

2. To delete the drawn lines, you need to click the lines to be deleted, and then click Delete on the toolbar again. Or it is faster to select the row to delete and press the delete key.

3. To modify the line drawing, you can right-click the line to select the content to be set, or double-click the line to set the line drawing style.

4. If the line drawing is wrong, you can click the line drawing, the "Select" button on the toolbar, or right-click the stand-alone computer to finish the line drawing.