View.FieldShading procedure builder

View.FieldShading (Word)

Returns or sets on-screen shading for fields.

wdFieldShadingAlways - Always apply, wdFieldShadingNever - Never apply, wdFieldShadingWhenSelected - Apply only when form field is selected.
ActiveDocument.ActiveWindow.View.FieldShading = _ 
 wdFieldShadingAlways