Setting this variable to 0.5 will make lines half as thick; setting it to 2.0
will make lines twice as thick. Usually, setting this variable to 0.5 will
fix the problem.
This setting only works if "Show Widths" is enabled in UG. To enable "Show
Widths":
1) Go to Preferences --> Visualization --> Line tab.
2) Check the "Show Widths" checkbox