3D View
The 3D View is where you do the graphic editing of your model file and where your actual structure can be viewed.
Click on image to enlarge it
Notice that there are several toolbars located within the 3D View panel. You can rearrange these toolbars to your liking, by clicking on the 4 dots 
and dragging the toolbar to any space along the window's perimeter.
You can close this window at anytime by clicking the 
(Close icon) to the top right of the 3D View panel.
See the Graphic Display