The top and wall can be used for area settings such as outer circle, inner circle, inner right angle, chamfer, and right angle. The operation steps are as follows:

1. Enter the custom top and wall, click on the ceiling, and select "Ceiling Design";

2. Right-click the white area with the mouse and draw a rectangle first;

3. Left-click to select the rectangle with the mouse, select the type of chamfer on the right, and then enter the radius value to modify.