I'm using landing pages for individual products. I link to these from a button on my website. I'd love it if it were possible for the customer to close that landing page with an X to return to the main website.

The reason I used landing pages for individual products, is because when I insert a product block into my website, it doesn't allow me to edit the product description, which is very short as it's what appears on the payment page. However, I can edit the product block if I drag it onto a Landing Page. So the other great improvement for me would be to be able to edit the product description when it's a block on a webpage.