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.
If a form has already been submitted by a user, is it possible to hide the form so that it is no longer visible?
I'm not sure I understood your question correctly. By default, when a user/visitor/respondent submits a form, what they'd see afterwards is just the Thank You page. This means that the form will no longer be visible as soon as it is submitted.
Are you perhaps trying to ask how to limit the submission to be once per respondent? Meaning, once RESPONDENT A is done submitting, RESPONDENT A won't and should not be able to submit the form again.
If so, then just set up the Unique Submission option of your form.
Complete guide: How-to-Set-Unique-Submissions-on-a-Form
If we misunderstood your question, just get back to us with a bit more info and a better description of what you're trying to do so we can better assist you.