Click Turn Arrows in the left hand pane. The Valid Turns and Turn Arrows page is displayed.
Select a style of turn arrow from the drop down.
Select Turn Arrows to set their properties.
The Offset from intersect sets the closest point of the turn arrow this distance from the roundabout.
The Minimum distance before crosswalk sets the minimum distance the turn arrow is placed from the crosswalk on the side closest to the roundabout.
The Minimum distance after crosswalk sets the minimum distance the turn arrow is placed from the crosswalk on the side away from the roundabout.
The Length is the length of the turn arrow symbol.
The Width is the width of the turn arrow symbol.