You won't be able to dismiss this by usual means (escape or click button), but you can close it programatically based on user choices or actions.
"Was very happy with the whole process of selection, ordering, review and finished product. I wanted to add an extra line into the text and spoke to someone on the phone who explained how to include it. The proof review was very quickly emailed and the shower invitations arrived even sooner than I expected. It was a pleasure."