FullscreenForm | experimental fullscreen form concept where the idea | Form library

You need to save the values of your form for all the step inputs. Now since on every step you are changing the form component, so you cannot put those values in corresponding form component. Therefore you have to put those values in the parent container (i.e. MultipleForm). Now as you are maintaining a state of values of your child component in parent container, therefore you will have to put some kind of mechanism so that whenever there is any change in input in child component, it should update the corresponding state in parent container. For that you can pass a change handler function to you child component. So your form component should look something like this