How to have "form cover" image or a heading that remains at the top on all pages in my form?

could I replace this with a "form cover" image or a heading that would remain at the top even when moving pages (which I wouldn't mind being blocked by the website menu)?

I think you might want to try this Form Tabs Widget

 

You can also search for more options in our widgets gallery

https://widgets.jotform.com/search/header