Cursor Design Mode was there and then gone?

Not sure if this is a new feature that I just had a preview of, but there was a nice design mode pop-up to edit CSS in a more visually inuative way, but I can’t figure out how to access it again. You could adjust centering, font, padding, etc.

It is in the cursor docs: Browser | Cursor Docs

So I know I’m not crazy, but it doesn’t say how to access it.

Any ideas? I’ve clicked every button there is to click on the cursor interface lol.