decorative element, you just have to drag it from the sidebar. Once you have it in the blueprint, you'll be able to move it, spin it, stretch it, shrink it, and basically do anything you like with all the elements in the house.
Pressing the 3D button will let you switch from the blueprint view to the three-dimensional view. From this perspective, you can move freely all over the structure, zoom in and out, and also rotate the house. To go back to the normal blueprint just hit the 2D button.
Home Design 3D is a design tool that lets you work with both 2D plans and 3D representations. Ideal for creating a model of your dream house and seeing exactly how it would turn out.