You can either have the form expire and see this:
Or you can unpublish the form and see:
Neither of these screens is very user friendly. It would be great if we could customize the message displayed here on a per form basis.
That said, a workaround in the meantime is simply to remove the link from your site. This will significantly reduce (possibly eliminate) the traffic that form receives, but it does still open you to some unfortunate circumstances:
- If the link was sent in an email, it will still be active.
- If the link was shared on social media, it will still be active.
- If search engines have indexed the link, it will still show up in search results.