For example, you may need to make a photo smaller so it fits better in a collage or other design layout. Sometimes that's what we want, but more often, we just want to resize something, making it smaller or larger overall but keeping the original shape intact. They may be wider, thinner, taller or shorter, but they no longer look the way they did originally. One potential problem when reshaping things with Free Transform is that, well, we've reshaped them.
Drag any of the corner handles to adjust the width and height together.