World_Countries.shp
layer
in the Map Layers pane to display
the corresponding map style property sheet below it. Visible in Overview
property
and check that the value is False
so that
this data source is not displayed in the Overview pane. Line Color
property
in the map style property sheet, click the button, set the Line Color
value
to white using the Color Editor displayed and click Apply. Filled
property
in the map style property sheet and set the value to False.