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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You can actually set the Cell Width to your desired width. I tried to clone your form and set it to 80. To set the Cell Width, right click the survey matrix field then choose Properties, under cell width, set it to 80. You can adjust the number higher or lower until you reached your desired width. See screenshot below:
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