1. Open the picture-in-picture in the cutout, hold down both ends of the video and drag it to the middle to reduce the video size

2. Drag the video to the target position and click "Blending Mode"

3. Select "Dimming Mode"

4. The original video and the picture-in-picture video will have a darkening fusion effect. The next thing to do is to drag the slider to the left to adjust the opacity.