the picture shows the normal’s not connected and a compleatly flat landscape stuff like sand would fall into the bumps the normals create so cliffs can have sand dusted onto the flat parts of the rocks etc. the sculpt wont show different materiels unless you paint the on you want. you would need to Use a lerp controlled by a height/angle node to change material this is only set to paint layers. in the layer blend node add another connection called auto or whatever your lerp will fit into this your materials will go into the lerp (aswell as the spots there in now) the height node will go into the alpha to control the material shown and you will then be able to use both methods. check you tube out there are loads of tutorials for auto landscape materials. hope your brain dosn’t melt trying to work it out lol good luck.