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I have checked your form, https://form.jotformeu.com/61177630331348. To increase the spacing between the topmost of your form and the start of it before the header, you can use CSS codes.
Please add the CSS codes below to your form with the help of this guide, How-to-Inject-Custom-CSS-Codes
padding-top: 100px !important;
I hope this helps. Let us know if you need any further assistance. Thank you.