JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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.
I have tested the Designer and Theme tools with some of your forms, I was able to open both tools without any problem on my end.
Could you please share us the link to your form so we can test with it again?
Also, if possible, please share us a screenshot of the web console, that will help us to know if there is an error that is not allowing the tools to open.
These keyboard shortcuts will help you to open the console on Chrome:
Mac: Command + Option + J
Windows: Control + Shift + J
This guide will help you to upload a screenshot with your next reply: How-to-add-screenshots-images-to-questions-in-support-forum
I have also noticed that your account was as "Dormant" status, I have set it to active, please check and let us know how it goes.