Why can't I see the "grass length" property?

I looked on the documentation about terrain, and I saw this about grass.
Screenshot 2024-04-17 at 7.14.41 PM
apparently, you can change the length of grass in your game. So when I tried to adjust it, this is what I saw.


How can I fix this?
(here is the link to the documentation)

Nevermind! I just realized it was a beta feature.

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