Line Widths
Auto-assign Widths: Assigns widths based on trunk type. For example, a T3 is wider than a T1 and an ET1G is wider than an ET100M.
Reset Widths to Default: Restores widths to the default where all link widths are the same.
Alternatively, to manually set the widths, right-click on the link and select Set Line Width... from the Legends menu, Type submenu of the map window’s left pane.