Landing Page Form Thank You Page Redirect

I created a landing page form and a thank you page redirect.

I embedded the form onto a webpage in a smaller size. Upon submission, the thank you page is remaining within that small size (when it was intended to be a full page).

Has anyone had success altering/adding code to have the form actually redirect to a new page (even opening a new window would be better)?

I think you’d have to have your own custom thank you page and set the redirect to that rather than using the LP builder thank you page. Then you’d have control over how that worked.