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.
As I understand from your query, you want to adjust form width and make your form mobile responsive.
1) Adjusting form width: You can use designer to enter a value for the form width:
Or you can inject CSS code to your form:
Here is a guide on injecting CSS code into your form.
2) Making your form mobile responsive: You can use mobile responsive widget.
If some fields have styling issues after adding widget and arranging your form width, please contact us again. We can help to style your form further.