2D rebar Text Defaults - changing text style after 2D annotations with Modify Rebar tool

Im generating some DVs and annotating with the 2d Rebar tool set.

Im able to customise and change the size of text for drawing annotations before creating a DV with the Text Default tools, but I cant seem to be able to change an already annotated  model drawing. 

Is there a way to do this?

Thanks

regards