Samsung UN55FH6200FXZA - Manual (Page 231)

Translucent , Solid and Flashing .
Window Opacity : Select the level of
transparency you want the window of
your digital captions to be.
Edge Type : Select the type of outline
you want on your digital captions.
Edge Color : Select the color outline you
want on your digital captions.
Return to Default : This option sets the
Size , Font Style , Font Color , Background
Color , Font Opacity and Background