Zone edge settings can be accessed with the Zone Edge Settings command. There are user-changeable parameters in the Settings - Zone Edge dialog.
Location of the Zone Edge Settings Command
You can access it under the Ribbon menu Home tab, Zone title.
Zone Edge Settings
Sets the color of the zone edge. When the color box is clicked, the appropriate color is selected from the window that opens.
Line thickness is selected. When the down arrow button next to the box is clicked, the appropriate thickness is selected from the drop-down list. The thickness selected here is only valid on the screen. It does not affect the drawing printouts.
Line type is selected. The appropriate line type is selected from the drop-down list when the down arrow button next to the box is clicked.