When SA is opened, or the New File button pressed, it will automatically look in the Analyzer Data\Templates directory for a "default" template and will open using its settings. If no template is opened SA will open using its saved settings, which are recorded in the windows registry. To edit these settings press the No Template Default Options button.
The No Template Default Options provide control over default units (Length, Angle, and Temperature) and the default Decimal Digits for Display. The Units and Display units can also be adjusted while a job file is open by going to the corresponding tab in the User Options.