JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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You've mentioned "form collapse" but provided us with no details.
Are you trying to understand how to use or find it? Or?
You can easily find and use the form collapse field in the formbuilder when you edit your form. It is found under "Survey Tools".
If that is not what you meant then please return to your thread here and provide us with more details so that we can assist you better.