There are several ways to control your view of objects in the Graphics window.
ViewCube — Dynamically control the view.
View tab — Change the view.
Principle Views — Select a standard view.
User Views — Save views to select them later.
Refreshing the view — Refresh the view if it has failed to update automatically.
Show and Hide menus — Show or hide types of items.
Entities dialog — View a list of all entities in the document.
View Options — Set the options for viewing the document.
Use the tabs at the top of the Graphics window to switch between open documents.