Hi everyone

I have an image and I was doing segmentation on the image. let’s say for example a human body image. Now I want to decompose the image by the segments of the segmentation that will only show me one part, for example, I have segmented every part of the human body I want to show only the hand or only the elbow.
Can someone guide me for a tutorial or explain to me how to do it.
The file I have: