multistep_form_framework-8.x-1.x-dev/modules/multistep_form_framework_examples/multistep_form_framework_examples.multistep_wizard.yml

# Put same id into your form's getFormId method.
# @see \Drupal\multistep_form_framework_examples\Form\BookBuyMultistepForm::getFormId
multistep_form_framework_examples_book_buy_multistep:
  # (optional) You can use wizard to provide more as a form_state information holder.
  class: \Drupal\multistep_form_framework_examples\BookWizard
  steps:
    -
      # You can use step id as identifier to skip, or to return to certain step.
      # @see \Drupal\multistep_form_framework_examples\Form\BuyBookStep\Description::goToFirstStep
      # @see \Drupal\multistep_form_framework\Wizard\Wizard::setCurrentStepById
      id: greetings
      class: \Drupal\multistep_form_framework_examples\Form\BuyBookStep\Greetings
    -
      id: book_attributes
      class: \Drupal\multistep_form_framework_examples\Form\BuyBookStep\BookAttributes
    -
      id: description
      class: \Drupal\multistep_form_framework_examples\Form\BuyBookStep\Description
    -
      id: graz
      class: \Drupal\multistep_form_framework_examples\Form\BuyBookStep\Congratulation
  # (option) Enables ajax for the form.
  # @see multistep_form_framework/src/Step/BaseStep.php:94
  ajax: TRUE