enabling layer system?

Using the same engine, and there actually is no edit prefs>general>expeimental>Landscape, category which is supposed to contain the required ‘landscape layered system’ ,that we need to enable.
Has to be a bug as I don’t have it either,indicating since no one else is talking about this I guess its not popular?

Granted, the instructions are for 4.23 but it doesn’t say its exclusively for 4.23, nor would I suspect it to be.

Anyone know what is going on ?