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I have cloned your form http://www.jotform.com/53574744391160 and I was not able to replicate mentioned issue. I was able to make first four fields not required. Here is my cloned form:
Are you still unable to save settings? If so please try to reload your form or log out and log back in to your account. You can also try with different browser.
If you are still unable to save changes please provide us ID of your form and tell us which fields you want to make not required.
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