What is JotForm?
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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We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I checked and test the form https://form.jotform.com/61547552039256 and it is mobile responsive.
Since the form was already using mobile responsive widget it will defiinetly become responsive on mobile browsers.
Hope this help Let us know if issue still persist.