What is JotForm?
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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We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I checked your form http://www.jotform.co/form/61581869974879 because it is the one that has Dynamic Dropdown widget but the widget already has a height of 34px. The width of the widget changes because it adopts to width of the form and the screen.
The max-width of the widget was also set to 600px so I think it is fine.
If you are referring to a different form though, please give us the form link and we will be happy to assist you further.