Samsung UN55FH6200FXZA - Manual (Page 230)

Cyan . The default is Black .
Window Color : Select the color you
want the window of your digital
captions to be.
Font Opacity : This adjusts the opacity
of text. Options include Default ,
Transparent , Translucent , Solid and
Flashing .
Background Opacity : This adjusts the
opacity of the caption background.
Options include Default , Transparent ,