While navigating the project it might be useful to change the field of view. It is the same effect that you get in a camera by opening/closing the camera lens. It might be useful to change the FOV (Field Of View) especially when you have very small rooms.
You can change the FOV clicking the Field of View button in the Navigation group of the Ribbon.
If you already saved the 3D View, you can modify it also in Layout window: click the right mouse button over the view nd select command Properties.
This article is valid up to version 2017