while I'm design part in solidworks by using weldments the units are in mmks. but while simulation it convert in to inches (only diameter of welment profile)

Section Standard-iso/tube/12mm

Section Area: 113.097in^2 (hear it must be mm^2)

Length:113.291mm

Volume:1.24763e-005m^3

Mass Density:8000kg/m^3

Mass:0.0998102kg

Weight:0.97814N

I don't no how to change to mm units in simulation. can anyone help........