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.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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.
Unfortunately, we do not have any option to restrict enter key to submit the form. However, it can be done by editing the source code to host the page on your webserver. Please refer to the thread below that can help with this workaround.
Also, you may have the fields as required so that if any fields are left empty the form cannot be submitted.
Hope this information helps!!