I wonder why when you click "edit Terrain" and place "Void Plains" or "Desert Mountain" or "Snowy Mountains", back in the normal view its all just dark-red and without facades etc. Isnt there a way to correct or add this?
It only places the facades automatically along the edges of the areas that are occupied by those types of terrain. If you want to make the facades go further into the areas, you have to place them manually and they may look weird in the game. You can place facades manually if you want to go to the trouble to do it. I have had to learn how as this is the only way to effectively carve a new passageway through an existing mountain range.