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Always test what the Web Form will finally look like, with all the customizations. This includes profiles and translations. There is a chance that the customer will need to optimize the various values adjust what they provide in the profile and translation to have the best possible results from all the customization.
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Below are some mockups of one of our workflows which clearly shows show you how the Web Form will be rendered with (on the left) and without (on the right) applying the theme. The theme used in this case is MOBILE_MINIMALISTIC.
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