The Main Canvas is where all tracks and objects are drawn.
The scale of Main Canvas can be changed by the Zoom
menu items under the Edit menu.
You can also use the Zoom buttons on the Tool Bar.
Tracks will be drawn with two lines if you zoom in.
When the drawing scale is 1:1 a dashed centerline is also drawn for each track.
You can change which portion of the layout is displayed by using the
Map Window.
The size of the Main Window (and some other windows) can be changed by
dragging on the Resizing Borders.