TextFrame.HorizontalOverflow (Excel)

Returns or sets the horizontal overflow setting for the specified object. Possible return values are xlOartHorizontalOverflowClip - Hide text that does not fit horizontally in the text frame, xlOartHorizontalOverflowOverflow - Allow text to overflow the text frame horizontally.

This property only has an effect when the WordWrap property is msoFalse (0).

Dim tfe As TextFrame: Set tfe = 
tfe.HorizontalOverflow = xlOartHorizontalOverflowClip