Why is there no help with the Viewer. I want to know how the eye position and the walk around tools work.
They work the same as in SketchUp. So the main app help works for all the Viewer tools.
Walk Tool
http://help.sketchup.com/en/article/2458159 — Help Articles
Look Around Tool
http://help.sketchup.com/en/article/2458160 — Help Articles