During the development of Logic App, in the response shape if the previous used shapes output is not visible in the designer
Check the runafter() contains the shape that you are trying. For example, in the below Logic App I have a parallel shape that contains 5 Rest calls and after that one response shape.
But I couldnt get the response of REST 4’s output. Once I added them in the runafter()
After adding dependent shapes in runafter()
Now you would be able to access the shapes output in Response.