The View button 
allows you to quickly jump through different perspectives.
It updates the camera from Front, Left, Top and Three-Quarter views.
This can be helpful when you want to move and rotate an object more precisely, ensuring that your objects are correctly aligned to each other.
After importing 3D objects it can also be helpful to look at your model from different perspectives to check it before you start building your Jig.
Any changes that are required to the object are best discovered early so they can be updated, before any formatting or steps added to the Jig.