3D Terrain
Enable 3D Terrain
Once a site is created head to 3D in canvas and toggle the 3D Terrain option by hovering over the 2D/3D button and selecting Toggle 3D Terrain.
You will notice the typology moving/adjusting to the modifications that are made within the Cut and Fill properties of your site/region
Note: 3D context is currently only visible in the desktop application not supported in the web viewer).