JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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.
I believe you are referring to the length of the header bar.
Please insert this custom CSS code in order for the bar to go all the way horizontally:
margin: 12px 0px 12px 0px !important;
Here's a guide How-to-Inject-Custom-CSS-Codes. Here's the result:
Hope that helps. Thank you.