WYSIWYG enables you to use metric or imperial units at any time. You may choose to set a default type of unit, and you may choose to switch unit type on the fly.
You can also indicate whether you want these units measured in whole numbers, fractions (to the sixteenth of a inch), centimeters, or millimeters.
Note: These choices vary based on whether you selected Metric or Imperial in step 3.
Double-click the units display on the Status bar.