expression.StyleAreaWidth
expression Required. An expression that returns a Window object.
Remarks
When the StyleAreaWidth property is greater than 0 (zero), style names are displayed to the left of the text. The style area isn't visible in print layout or Web layout view.
Example
This example switches the active window to normal view and sets the width of the style area to 1 inch.
With ActiveDocument.ActiveWindow
.View.Type = wdNormalView
.StyleAreaWidth = InchesToPoints(1)
End With