JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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May we know what do you mean when you say the form builder page is not fully loading? Have you tried refreshing the page after it loaded to see if it will load properly after? May we also know what browser are you using when you are experiencing the issue? Have you tried using a different browser?
Also, are you loading the form builder page to edit an existing form or you're trying to create a new form?
I have tried editing an existing form on my end and seems to be working properly.
We will wait for your response. Thank you.