Qual a finalidade do FORMULÁRIO EXPANSÍVEL?

Gostaria de saber como é utilizado o formulário expansível

I believe that you are referring to the Form collapse tool in the form builder that can show and hide multiple fields. Please refer to the guide below that can help you with using form collapse tool.

https://www.jotform.com/help/297-Show-or-Hide-multiple-fields-at-once-using-form-collapse-tool

If you are referring to something different, please provide us with more information so that we can guide you in the right direction.

Thank you!