Document.JustificationMode (Word)

Returns or sets the character spacing adjustment for the specified document. Possible return values are wdJustificationModeCompress - Compress, wdJustificationModeCompressKana - Compress, using rules of the kana syllabaries, Hiragana and Katakana, wdJustificationModeExpand - Expand.

ActiveDocument.JustificationMode = wdJustificationModeCompressKana