You can use the New Files page to specify the default options for new part documents.
Select the default Setup type, Unit of Measure, and Initial stock dialog.
Inch units set FeatureCAM to size the part, its features, and the tools in inches and fractions (decimal display) of inches. All measurements are in inches.
Millimeter units set FeatureCAM to size the part, its features, and the tools in millimeters. There is no option for setting larger metric units as the default.
Optionally deselect Always ask when a new document is created.