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.
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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 should be able to widen the input of the text area field is you increase the number of "columns".
Here's an example:
You can also just set their widths using the Form Designer Tool. Here's a guide that you can refer to: https://www.jotform.com/help/300-Form-Designer-Tutorial-Let-s-create-fantastic-forms-. Below is a screencast how I widen the full name and the email field.
If you are familiar with CSS, then you can also inject your own custom CSS code widen the fields width. Here's a guide that might help: https://www.jotform.com/help/75-Customize-your-Form-using-Custom-CSS-Codes
Let us know if you need more assistance on this.