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In order to obtain the statistics about the mesh (Click) Mesh > Info > Size, as shown in the image below.
Then, you should obtain the following output in the Command pane.
In order to bring up the display options (Click) General > Mesh > Display. Make sure you have inlet, outlet, pipewall and interior-solid in Surfaces as shown in the figure below.
Please review the "Laminar Pipe Flow" tutorial to understand how to rotate, zoom-in and zoom-out the geometry in the Graphics Window.