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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To confirm, you want to export an excel file of the submissions, where it dynamically changes depending on the number of actual submissions that you received from the form? If this is the case, unfortunately, it is not possible. But, if you would like to have a report display that updates or shows the latest submissions that you have real-time, then you can try setting up an HTML Table Listing report.
Please do let us know if this helps.