You'll find several useful commands for controlling the views and layouts of the 3D viewport in the top ribbon menu under the 3D ribbon tab.
The import/export ribbon group contains several useful commands for importing and exporting 3-D.
Import/Export
Import
Click on the 
button to import 3D into your design.
Export
STL
Click on the 
button to export a STL file.
STL (an abbreviation of "stereolithography") is a file format native to the stereolithography CAD software created by 3D Systems.The STL format specifies both ASCII and binary representations. Binary files are more common, since they are more compact.An STL file describes a raw, unstructured triangulated surface by the unit normal and vertices (ordered by the right-hand rule) of the triangles using a three-dimensional Cartesian coordinate system. In the original specification, all STL coordinates were required to be positive numbers, but this restriction is no longer enforced and negative coordinates are commonly encountered in STL files today. STL files contain no scale information, and the units are arbitrary.
OBJ
Click the 
will export the 3-D to a Wavefront OBJ file.
OBJ (or .OBJ) is a geometry definition file format first developed by Wavefront Technologies for its Advanced Visualizer animation package. The file format is open and has been adopted by other 3D graphics application vendors.
The OBJ file format is a simple data-format that represents 3D geometry alone — namely, the position of each vertex, the UV position of each texture coordinate vertex, vertex normals, and the faces that make each polygon defined as a list of vertices, and texture vertices. Vertices are stored in a counter-clockwise order by default, making explicit declaration of face normals unnecessary. OBJ coordinates have no units, but OBJ files can contain scale information in a human readable comment line.
Collada
The 
will export the 3-D to a Collada file.
COLLADA (COLLAborative Design Activity) is an interchange file format for interactive 3D applications. It is managed by the nonprofit technology consortium, the Khronos Group, and has been adopted by ISO as a publicly available specification.
POVRAY
The 
button will create a POV RAY photorealistic render file.
If you have POV RAY installed then the POV RAY program will start and render your file in 3D. The Persistence of Vision Ray Tracer, or POV-Ray, is a ray tracing program which generates images from a text-based scene description, and is available for a variety of computer platforms.
Views
Model
Command
Pan
Rotate
Add
Multiple Viewports
You can have anywhere from 1 to 4 views into the same scene. Click on any of the five buttons in the viewport's menu to select the view configuration. The pattern in the buttons show you the layout of the individual views
