`Insert URL here` field + `retrieve` button must stay when `retrieve` button is clicked

[queroin]

This is rather an opinionated one but I think it's convenient not to re-enter urlgent.com again on the address bar of the browser. Instead, when the Retrieve button is clicked and a URL is retrieved, the field & button must stay, so that I won't need to click back or re-enter the URL.

It's the most typical spot for a field&button to stay (on the highlighted yellow line). ✌️