Panasonic TC-65FX800X Instruction Manual page 164

Foreground opacity:
Selects the opacity of text.
Background:
Selects the color of text box.
Background opacity:
Selects the opacity of text box.
Outline:
Selects the outline color of text (Identifies the settings options on the
screen).
Reset to defaults
Resets all Closed Caption settings to factory default settings.
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