I needed to make the person in the video look thinner. So I right-clicked the video clip and chose properties / media / pixel aspect ratio. I changed it from 1.0 to 0.75 to get it thinner. When I did this, it pulled in the sides of the video, so there's black on the left and right of the video. I have Movie Studio platinum 13.0 build 987. Here are screenshots of the normal and thinner person.  How can i fix this?