At the bottom of the Display tab of the User options is a control for the Decimal Digits for Display:
Internally, calculations in SA are performed (and numbers are stored) with a high degree of decimal precision. However, when numeric results are displayed in the user interface, they are typically rounded to a preferred decimal precision in order to simplify the display. You can control the number of decimal places used when displaying different categories of values. Specifically, you can independently control decimal precision for length, angle, scale, unit vector, and weight values.
You can change the decimal precision for a given file at any time without incurring any additional internal numerical error.
Having a different decimal precision for different types of numbers is useful, since different types of numbers are expressed in different units. For example, three digits of decimal precision for an angle (eg. 0.001°) is only accurate to 3.6 arcseconds--not enough for some applications. However, three digits of decimal precision in length when working in millimeters is too much precision for most applications (1 micron).
Default Decimal Precision settings are or part of the (No Template Default Options) which can be edited on the Machine Configuration Tab.