Curved walls can be created using the Curved Walls tool, or by using a series of small, segmented straight walls.
Creating curved walls using the Curved Walls Tool
To create a curved wall, select Build> Wall from the menu and select from the type of curved wall that applies to your situation, such as a Curved Exterior Wall , or Curved Interior Wall .
Once you have selected the appropriate curved wall type, click in the plan and drag to create a curved wall.
You can also convert a straight wall into a curved wall by using the Select Objects tool to select it, and then clicking on the Change Line/Arc edit button. You can then use the edit handles to further adjust the now curved wall segment.