Select percentile line > Editor > Edit Percentile Line > Attributes
Use to change the type, color, and size of your percentile lines. To add a percentile line to a graph choose Editor > Add > Percentile Lines.
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.
Apply same attributes to all percentile lines: Check to apply same attribute changes to all labels.