Eu acredito que você precisará de uma macro para isso.
Como eu nunca escrevi uma macro VBA, aqui estão algumas citações de pessoas que possuem:
De Como faço para me livrar do campo de formulário sombreamento no Word? :
If you are using a highlight on the formfields - which you must have put before you protected - then you have to unprotect the document to remove the highlight.
Dim oFF As FormField
' remove shading
ActiveDocument.FormFields.Shaded = False
' unprotect
If ActiveDocument.ProtectionType = wdAllowOnlyFormFields Then
ActiveDocument.Unprotect
End If
' remove highlighting
For Each oFF In ActiveDocument.FormFields
oFF.Range.HighlightColorIndex = wdNoHighlight
Next
' re-protect
ActiveDocument.Protect wdAllowOnlyFormFields, NoReset:=True, Password:=""
Mais algumas informações de Altere a cor que indica seções que são editáveis :
There isn't a way to change the highlight colour used by Word to shade editable regions. You can programmatically turn shading of editable regions off by using the Window.View.ShadeEditableRanges property and setting it to False.
Of course if you do this, you will lose the automatic yellow highlighting that Word provides. You would then have to write some code to highlight the ranges by yourself that are editable in the document, code like:
Range.Shading.BackgroundPatternColor = Word.WdColor.wdColorGray15
Some problems with this approach:
1) If the user selects the entire region and deletes it the gray background color will be lost.
2) The gray background colors will print when the document prints, so you'll have to handle the BeforePrint event and remove the gray background colors before it prints.