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.
If you have applied a theme on your form and you don't like that. Then you can remove it from the "Themes" page, and nothing will be loss other than theme.
I would also like to update, you can get your old form, from the Form revision history, please check the below article for doing that:
If you face any issue, or need further assistance, feel free to revert back. Thanks