Rulers
Canvas
displays rulers at the top and left that allow you to easy scale the elements
of your project. As you move your cursor over the canvas, you can read its horizontal
and vertical positions from the status bar of the application window.
You can set the rulers to be displayed in one of the four units: Inches (in),
Pixels (px), Centimeters (cm), and Millimeters (mm). The units appear in the
upper left corner where the rulers meet. To change units, select Canvas
from the Edit menu and check the desired units in
the Canvas dialog.
To hide/unhide rulers, select Canvas from the Edit
menu and check/uncheck Show rulers checkbox in the
Canvas dialog.