Heya,
If you change the Landscape Material you can get it.
The default landscape material doesn’t have it, but if you use Ch4 landscape materials, they do.
If your creating a terrain, select the Material slot and change it to MI_Landscape_Chpt4
If your terrain exists, my editors not open yet and I can’t remember clearly, you can change it from either the Paint Tool in Landscape Mode, if its there, or by the Landscape root in the Content Browser