Yes, it's simble but many users don't know this procedure...Let's see how we do it?
Open SolidWorks and go to the drawing plane. Then select 'Tools' in the menu bar.
Under tab tools, select 'Options' as shown in image.
Once the options window pop out, select 'Document Properties'.
Finally click the units let's say icon, and you'll see a new window pop out with different types of units avilable in a table. Select the required units needed for your drawing, and then click Ok.