Form Success and Error

Hi! I’m facing a problem of editing success and error messages for my form.
So, when I choose Form block and go to setting and choose success or error nothing changes. I just can’t see the text element or any other element. I still see only the form itself.

I’m sure there is something I’m doing wrong, not the webflow editor. But what?

Here is my website - Webflow - Туры на Бали