As you create a model in 3D, you need to view it from all sides. In SketchUp, you orbit, zoom, and pan all the time as you draw:
To create a top-notch document or presentation, you need to not only draw the details precisely, but also keep an eye on the document pages as a whole. To help you out, LayOut has the Zoom Tool () and Pan Tool (). You find these tools on the View menu. Because you'll likely use them often, they're also accessible with your mouse.