Select slice labels > Editor > Edit Slice Labels > Leader Lines
Use to change the type, color, and size of your slice label leader lines. To add slice label leader lines to a pie chart, choose Editor > Add > Slice Labels.
Lines
Automatic: Choose to accept the default line attributes.
Custom: Choose to change the line attributes.
Type: Choose a line type.
Color: Choose a line color.
Size: Choose a line thickness.