All units used by the software can be individually defined in menu SETTINGS, GENERAL .
Here you can select for all available value types, e.g. area, length or volume, corresponding units like meter, centimeter, feet, inch ... . Settings can be saved as default for further usage with the "save as default" button on the right side of the dialog.
In all dialogs numeric input fields change their units, e.g. when you change the unit for a length from meter to centimeter, every dialog expects now values in cm.