I removed the boulders by replacing them in the Stones_01 Landscape Grass Type node. You can find it in the folder with the stone meshes. I originally tried just deleting it from the material, but then it wouldn’t compile for me. I just replaced all the boulders with more grass. I don’t know how to scale the grass, but when I replaced it with other grass meshes, it seemed to be at a more appropriate scale. Hope that helps.