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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.