StepsForm manages the data of sub forms through a Provider, each word form is a complete set of data that is combined in StepsForm to form the final data. It also comes with a progress bar and a related API to manage the progress bar.

StepsForm inherits from Form.Provider, see the documentation here, the value of the transformed moment is a function provided by ProForm, so onFormFinish and onFormChange where the values are untransformed.

Step-by-Step Forms