I am trying to underline or highlight legend and axes labels in chart but the change is not reflected.
chart.Legend.TextFormat.PortionFormat.FontUnderline = TextUnderlineType.Heavy
It does not work for GetThumbnail(). Exported slide, however, is updated.
Moreover, there are text manipulation options specific to Text Frames that I need to access for Legend and Axis labels. Is there a way to do that?