how to check line's thickness?

Hi,

I choose optons -doc properties -line thickness

and this determines how lines shall be printed

but cannot get information wchich lines are thin , thick(6) and so on

of course setting component line font is obvious

but what about poroperties 3d sketch '  lines

how will I know how fat they are? is this always default ?

and can I change that?

soory for long post

SolidworksDrawings And Detailing