I had to temporarily remove the viewport from nUI because of the sky and water rendering bug that was introduced in the WoW 4.0 patch -- no addon can successfully use viewports at present without breaking how the graphics are rendered.
That said, you do have the option to zoom the camera out further... go to the interface video settings menu and set the zoom to max distance and mousewheel the camera out. The other option is to use alt-z to hide the UI entirely.
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