1. Click the "Draw Line" button above the K-line diagram to open the line drawing tool panel.

2. Select the icon to draw a line, press the left mouse button at the starting point of drawing a line in the K-line area, drag the mouse to the end point of drawing a line, and let go to draw relevant graphics.

3. Select the line drawing with the mouse, you can drag the starting point and ending point of the line drawing, and adjust the direction and angle of the line drawing; You can also set line drawing properties.