Draft Mode helps the visitor (who is filling the form) save the half-filled form as a draft and start filing the form again when available.

1. Go to the Add/Edit form.
2. Go to form Settings.
3. Enabling ‘Form submit as draft’ is simple. Just check the corresponding checkbox in the form settings and save your changes. 
4. The form will appear with a “Save as Draft” button. When you click this button, a unique link will be provided to the visitor. The visitor can then use this link to complete the half-completed form again.

This feature is useful when the massive form has many fields for the user to enter.