If I create a new Google Form, and leave the "Limit to 1 response" option unchecked:
At the end of the form, the user will see a "Submit another response" link:
However, I have an existing Google Form where that entry is always missing no matter what settings I try to enable/disable (e.g. "Collect email addresses", "Limit to 1 response", "Edit after submit", etc.):
How do I get the "Submit another response" link to show up?