Phabricator's custom form preview doesn't actually hide the hidden fields, instead it shows them at 50% opacity. It looks cluttered and doesn't provide a very useful "preview" at all. One line of css will fix the issue.
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This was now merged in Phorge itself (the fork of Phabricator):
Mentioned in the changelog:
https://we.phorge.it/w/changelog/2023.2/
Thank you for this nice code contribution!