Hi there,
Are you talking about the background image (laptop image) in the page header?
It’s not really responsive as that’s the nature of background images.
You can try adding this CSS though which is what that page is using:
.generate-content-header {
background-position: center top;
}
Adding CSS: https://docs.generatepress.com/article/adding-css/
If this is not what you are looking for, any chance you can provide a link to your site? Thanks!