How to add waistline in tile flooring?

Click "Customize -Tile Flooring" and select the wall or floor to enter the tile flooring interface. Left-click to select the wall and click "Add Waistline" to add the waistline. You can adjust the tile size and material of the waistline in the right property panel under "Edit". You can also modify the starting point and height of the waistline in the right property panel under "Precise Paving".