DisplayUnitLabel.Position (PowerPoint)

Returns or sets the position of the unit label on an axis in the chart.

Possible Values are xlChartElementPositionAutomatic - Automatically sets the position of the chart element, xlChartElementPositionCustom - Specifies a specific position for the chart element.
ActiveWindow.RangeFromPoint.Chart.Axes(1).DisplayUnitLabel.Position = xlChartElementPositionAutomatic