Yeah, the doc is not up-to-date, the method to create a splines edit layer has changed in UE5.5, you now need to choose the type of the edit layer when adding a new one : press the ‘+’ button, then select the splines edit layer class type.
Then you just manipulate landscape splines using the landscape splines tool, as describerd here (https://dev.epicgames.com/documentation/en\-us/unreal\-engine/landscape\-splines\-in\-unreal\-engine), except you don’t need to hit the “Apply Splines to Landscape” button, since it’s done automatically as you manipulate the splines.
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Cheers,
Jonathan