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 found a way to make this work. I used conditional logic, set a new condition to hide the calculation field when the Email Address field is filled, and when it is emptied.
There is also an alternative method which can be used to hide the form fields:
Select a field > Click on a gear icon > Hide Field