How to select all tables in a Microsoft Word Document

It seems it’s impossible to do it from the user interface. But I found here that it could be done using a VB Macro:

Sub ChangeAllTablesToNormal()
Dim myTable As Table
For Each myTable In ActiveDocument.Tables
myTable.Select
Selection.Style = ActiveDocument.Styles("Normal")
Next myTable
ActiveDocument.Repaginate
End Sub

You may try to change ActiveDocument.Styles("Normal") to ActiveDocument.Styles("Tables Normal") as suggested by Abhishek if it doesn’t work for you.