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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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The Address field from Quick Tools is a set... unfortunately, you cannot break it down to make individual part of the full address field a require/not required option. It is either the whole set or none..
The workaround you can do is, to mimic the Full Address field by using individual Textboxes and Dropdown. This way you can then make each field required or not required.
Hope this help. Please let us know if there is more we can assist you with.