2. Open the drop-down menu and click the custom path under the operation path.
3. Open the drop-down menu of the effect option again, and click the curve.
4. Click the center of the shape, click at a suitable distance, and then move the mouse.
5. At this time, the path segment will form an arc. Click as many times as necessary until you are finished.
6. Free curves can be drawn freely in slides.
7. The following figure shows the drawn path line. When the ball is displayed, it will move according to its own trajectory.