• Enable Virtual Texture Support

Edit - Project Settings - Rendering (Engine Section) - Enable virtual texture support

• Select your landscape and add MI_Landscape material.

• Switch to landscape mode

• Go to Paint section and click on Create Layers from Assigned Materials

• Create Layer info for each layer

• Exit landscape mode.

• Select your Landscape in the level or outliner and scroll down to the Virtual Textures section in the details section.

• Click the plus button and add 2 Draw in Virtual Textures. Set them to RVT and RVT_Height.

• Click Create Volumes

Now you should see landscape layers. If your landscape is still black, try to go to Landscape mode, Paint section and paint any of the layer.