The canvas can be thought of as an infinite screen or bulletin
board on which you post viewports; you can imagine the canvas extending beyond
the main window and your monitor.
The visible portion of the canvas is called the drawing area, and you can
increase its size by increasing the size of the main window. You can display
the drawing area full screen using the View menu; you can
also press F11 to toggle between full screen mode and normal
mode.
You can position viewports anywhere on the canvas, and you can drag them
outside the drawing area. When viewports are positioned outside the drawing
area, you can cascade or tile the viewports to bring them back into view.
Viewports are not part of a model and are not saved between sessions.
This chapter explains how to create and manipulate viewports, text
annotations, and arrow annotations.