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.
Thank you for providing us the screenshot of the problem.
Can you also try first disabling the auto save option on the Form Builder.
User guide: How-to-Disable-Auto-Save
I also suggest testing other browser. Try Chrome browser also
Let us know if the procedure I suggested did not resolve the issue.
Use the chrome browser, auto-save function was also to off.
Change design, only much mark even if you press the save button is spinning round and round, can not be saved.
Thank you for providing the details. I test it on your form https://www.jotform.me/form/61251832024445 and I was able to produce the problem also.
I see a lot of red error on the browser console which probably were the reason the Form Designer hang up when saving.
I have submitted a bug ticket report to our higher team support to check on this.
We will let you know here once we have fixed this problem.
Because I was only want to add to the CSS of change we were able to complete the operation in the Form Style of CSS setting of prefarence.
I hope that the Designer tool is to move without any problems.
Since the Form Designer is hanging up on the form, you can add/edit the custom CSS code in the Preferences / Styles instead.
You can save the changes to the form thi way.
Let us know if this option will not work for you.