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.
Are you referring to the pop-up window when you click the options or properties of the field? I wasn't able to replicate your issue. Please check my screen animation:
You can click the "X" on the upper right corner or just click anywhere in your form. Keep in mind to save the changes first before closing the window.
If I misunderstood your concern, please provide a screenshot of the issue so we can investigate it further. Thank you.