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.
You can redirect to a different URL instead after form submission. You can just create or redirect to an empty page to make the page/form look like it was closed.
You can setup the form Thank You page following this user guide -Setting-Up-the-Thank-You-Page
Another method is to redirect to the URL page that have a script on load event that will automatically close the browser window when loaded.
This is not guaranteed to work since most browsers tend to block scripts that are automated.
The script should be something similar to what was described here.
Hope this help. Inform us if you need further assistance.