ShowCategoryLines: Boolean;
The ShowCategoryLines property determines whether lines are displayed between category labels on an axis.
The property is relevant only for category axis (X axis).
The property is set to False by default, separating lines are not displayed. When the property is set to True, separating lines are displayed. Separating lines are perpendicular to the axis line. They are displayed between the categories in accordance with tick mark lines settings (color, thickness, line type, and so on).
See below examples with separating lines enabled (True - left) and disabled (False - right):
See also: