Address Validator gives capitalized suggestions, it's just how we get the suggestions from our database. We primarily use USPS and FedEx databases. Uppercase letters are preferred on all lines of the address block.
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According to the USPS Publication 28, which is the guide on postal addressing standards, they prefer that the address be UPPERCASE but it's not a requirement.
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With that being said if you don't want the app to prompt suggestions merely for capitalization, you can enable this option:
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App Dashboard > Address Prompts > Advanced Options > Do you want to ignore proper address formatting > Yes
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