You can customize the size of furniture after it is placed in a drawing. The furniture can be customized in length, width, and height.
(NOTE: Placed furniture can only be selected while in the Furnishings mode, selected from the main design menu)
Click Furnishings from the main design menu at the top.
Select the furniture item that you want to change and options will appear at the right.
Change the length and/or the width as needed. Use the arrows to increase or decrease the size.
The height will change the overall vertical size of the object. If, for instance, you change the height of a chair: the overall height of the chair will change, not just the legs or back.