LineGroups are used to control the appearance of various types of lines.
To change the LineGroups definition file
If you have write permission, you can edit LineGroup.csv to add your own LineGroups.
This file is usually in:
$INSTALL_DIR/Mod/TechDraw/LineGroup/LineGroup.csv
Where $INSTALL_DIR is the directory where FreeCAD was installed, for example
/usr/share/freecad/Mod/TechDraw/LineGroup/LineGroup.csv
You can specify your favorite defaults in the TechDraw Preferences.
C:\Program Files\FreeCAD\data\Mod\TechDraw\LineGroup\/Applications/FreeCAD.app/Contents/Resources/share/Mod/TechDraw/LineGroup//usr/share/freecad/Mod/TechDraw/LineGroup/
/usr/share/freecad-daily/Mod/TechDraw/LineGroup//snap/freecad/current/usr/share/Mod/TechDraw/LineGroupNote: A new preference has been added to allow you to use your own personal LineGroup file.
;FreeCAD LineGroup Definitions
;Format: *GroupName,thin,graphic,thick,extra
;thin: hidden lines
;graphic: dimensions, centerlines
;thick: visible lines
;extra: not implemented
*FC 0.25mm,0.13,0.18,0.25,0.50
*FC 0.35mm,0.18,0.25,0.35,0.70
*FC 0.50mm,0.25,0.35,0.50,1.0
*FC 0.70mm,0.35,0.50,0.70,1.4
*FC 1.00mm,0.50,0.70,1.00,2.00