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Can you please give the form ID and I will check the problem that you mentioned.
When you were in the Designer, it appears that you may have accidentally moved the font size slider all the way to the left.
Please move it to the middle, where it says 16px, and the font should now be of normal size. Please refer to the following image:
Please let us know how it goes, or if you need further help with this, and we will be glad to assist you.
With kind regards,