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.
Yes, please check this guide: http://www.jotform.com/help/35-The-Importance-of-Form-Widths. For field positioning, check this guide: Form Field Positioning.
It is definitely possible to increase the width of the form. You do that simply by clicking on the Form Width option and then adjusting it to your desired size
Should you want to put 3 fields across, you should use the "Shrink" option in a field's property. That way, it only takes up the space it needs and not the entire line
With the Form's width big enough, you can now shrink 3 fields to occupy one line. This is the result..