Option for Subtitles does not exist on my NOS tv box

Using an Arris ZC4431KNO Cable Box with the updated software UX Version 6.0.18.

I cannot find any option to turn on subtitles for any channel. I assumed this would be available by pressing “Ok” or “Info.” Neither button works for this purpose. Note, I am looking for Portuguese subtitles, not English. 

Thank you for your help in solving this.