This dialog appears when you double-click a category(X) gridline of a chart or right-click a chart and then select Format Gridlines > Category(X) Gridline from the shortcut menu. It helps you to format the category(X) gridline in this chart. See the dialog.
The following are details about options in the dialog:
Line Color
Specifies the color schema for category(X) gridlines in the chart.
Transparency
Specifies the transparency of the color of category(X) gridlines in the chart.
Line Style
Specifies the line style for category(X) gridlines in the chart.
Thickness
Specifies the thickness for category(X) gridlines in the chart.
OK
Applies the changes and closes the dialog.
Cancel
Does not retain any changes and closes the dialog.
Apply
Applies all changes and leaves the dialog open.
Help
Displays this help document.