I have a Logitech M705 wheel mouse. The training video "Get started with SketchUp - Part 1"
at 5:05mins, it tells me that (without clicking on the left hand menu icons) in addition to merely zooming by using the mouse’s wheel,by I can also get the mouse to:
A) do an Orbit (by “pressing the wheel down”)
B) do a Pan (by “pressing the wheel down and hold the shift key on your keyboard”)
However although the scroll wheel does cause zooming, I can’t get either A) or B) to work.