Can no longer create user-specific links

Hello, I have created a feathery form and really like it.

At first, next to the “published” button there was a link button that let me create a link with a specific user ID. I used this feature a to create several links. However, I have returned to the form as I need to generate more links, and the button has completely disappeared.

How can I generate more unique links?

it was just moved: Unique Submission Links | Feathery Docs