Nondestructive Landscape Editing in 4.23 but not in 4.24?

Hey there!

I am using UE 4.24.1 and I really want to try the new non-destructive Layer based Sculpting mode and Spline editing like in this Video:

The documentation says, that I have to enable “Landscape Layer System”, but I can’t find these settings…

Here the link to the Documentation, what am I doing wrong?

Now I found out, that in UE 4.23 the checkbox exists, but not in UE 4.24, why?
This is a Screenshot of 4.23:

For anyone who has the same problem, it got answered here: