Workspace Format settings, where the relationship lines and entity box are bolded
In the Workspace format settings, the relationship lines and entity box are bolded. How to switch to a thinner line format?
The Pen Width is set to 3 or higher, which will cause the relationship lines and outlines to appear bolded.
Set the Pen Width in the Workspace Format menu option to apply to the current Workspace or go to Settings| Options | Physical Model | Workspace tab to set the Pen Width globally for any new Workspaces created from that point.