The View menu affects how you view the diagram. Zoom In enlarges the viewed diagram and Zoom Out contracts the viewed diagram. Particular scales can be chosen with the Zoom submenu. The Diagram Properties... menu allows the background colour to be changed and the grid characteristics (spacing and visibility) to be modified. These changes affect the current diagram only and are saved with the diagram.
Various features can be turned on or off with the following option items.
New View pops up a new canvas showing the same objects. Editing any object in any of the views will affect that object in all of the views.
Show All zooms the diagram to fill the viewable area of the canvas.