I tried to manually add <w:doNotEmbedSmartTags/> to the settings.xml, open the doc and SaveAs a new doc. The smartTags are gone.
When using openxml 2.16, <w:doNotEmbedSmartTags> and <w:smartTags> are not valid objects in the library.
I also tried to use the following in Macro,
ActiveDocument.EmbedSmartTags = False
and it did not work.
Would there be any other ways to remove all smartTags?