The View Window is that part of the middle of the screen (between the Navigator and Edit Bars) that displays the transport domain and various variables or features associated with the transport domain.
In the bottom part of view windows are 6 Tabs, which serve to switch the View window to a particular View (e.g., Geometry, FE-Mesh, Domain Properties, Initial Conditions, Boundary Conditins, and Results). Each Tab affects the configurations of the Navigator Bar and Edit Bar and shows different properties of the computational domain.