Posted by dellus on Sep 29, 2016; 9:47am
URL: https://forum.librecad.org/LC-not-showing-thick-lines-tp5714286p5714287.html

In normal drawing mode the line thickness is shown in real size, as set and as if in scale 1:1, regardless of the size of the drawn objects or the intended scale. So if you have a relatively small object you will easily notice differences in line thickness, while in a drawing of a large object like a building the lines all will seem very thin unless you zoom in very, very closely. Only in print preview mode with scale set properly, for instance 1:100, line thickness is shown as expected for print out, as in this mode line thickness is used in relation to paper size units.