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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If I understand correctly, you want to adjust the size of the title/label of the checkbox field on your form? It appears that the label you are currently using for your checkbox is a Text Field. Since it is a text field, we can easily adjust the size of the title by changing the font size of the text.
If you are referring to a different concern, please let us know so we may better assist you.