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I see according to your issue you're pretty much having a problem with different form fonts between your live form and the form in the editor.
Upon checking this I found I'm able to see the same problem as it does appear to be slightly smaller though the font type seems
If I'm not mistaken did you want the larger font that is in your formbuilder now?
Please allow me some time to investigate this more so that I can help you correct this issue.
So after looking more into this issue I found that it seems when you entered in some text into the html fields the form must have picked those up since in your form properties you had multiple fonts and I believe that was causing the conflict along side the set nova theme.
I made a few changes on a copy of your form to assist you further:
Basically, I kept the nova theme but changed over the form font to Verdana as a test and that also reflected on the whole form when viewed for both as it should but you can just change the font to another if you want.
Thank you so much.