1, click the brush tool, set the brush thickness, set the foreground color to blue, and draw a straight line or curve directly on the canvas (press and hold the shift key to click on both ends of the line segment);

2. Click on the desktop and draw a straight line with "Single Wireframe Selection Tool" or "Single Wireframe Selection Tool", drag up and down to set the thickness, set the foreground color blue, and "Edit-Fill-Foreground";

3. Draw the path on the canvas with the pen tool, set the foreground color to blue, set the brush size, open the path panel, right-click the path, and finish the stroke.