How to > View > Switch between 2D and 3D views
  
Switch between 2D and 3D views
There are two ways to view a 2D drawing:
1. When you load a 2D file, it automatically appears in the 2D viewer.
2. If you are viewing a 3D model and want to switch to a 2D drawing that is already loaded, click 3D Access and then, in the Window group, click Annotation.
To see a 3D model:
1. If you are viewing a 2D drawing, click 3D Access to switch to your 3D view.