Usability tests showed some users were struggling when seeing the word
"Required" as a legend (it's actually styled as a title), since this
isn't a common pattern when filling in forms. They were expecting
something like "Fields with * are required", and so the "Required" text
alone made them feel the sentence wasn't complete.
We could also add an "*" to required fields in addition to the
"Required" text. In this case, however, some users wondered what the
asterisk was about: "It can't mean 'required' because they've already
said these fields are required".
We'll probably have to revisit required and optional fields again. For
now, we're just doing a small improvement.
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