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.
Please try to set the Form width to 672 px. You can do it, by clicking on the "Design" icon of Form builder, and then need to click on the "Styles" link from Design popup. Please check the below screenshot:
You can also verify it on my Clone form here:
If you face any issue, or need further assistance, feel free to revert back.