For this, if you want your unit system to smaller units like Micrometers/Nanometers, then you will have to set it accordingly under File/SpaceClaimOptions/Units before you start your design.
Apparently, during active design, you can switch between Meters/Centimeters/Millimeters if you started with any of them as starting units. And similarly, you can switch between Micrometers/Nanometers if you with any of them as starting units.
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