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 don't have an option to disable the enter key.
However, it is possible to do this via your jotform's source code. Here's a workaround provided by one of our supporters on this thread: How-to-stop-form-submitting-when-enter-is-pressed
Another alternative way, add a CAPTCHA to your form. Here's a guide: https://www.jotform.com/help/205-How-to-Add-a-CAPTCHA-field
You can also enable the Required to one of your field. See the image below:
Hope that helps. Let us know if you need further assistance. Thank you.