3D Mode and 2D Mode
Use the 3D Mode to view 3D-models and the 2D Mode to view 2D-drawings.
To alternate between 3D and 2D click the 3D-Mode and 2D-Mode tab in the Mode group.
3D
Turn on the 3D Mode to view 3D-models. Clicking the 3D-Mode tab will do the same.
2D
Turn on the 2D Mode to view 2D-drawings. Clicking the 2D-Mode tab will do the same.