Hi @MissMarple60
Thanks for reaching out to the Roku community!
Please check if Captioning is set to “off” on the Roku main page under Settings > Accessibility > Captions Mode > OFF.
Please note that most channels and apps contain their own settings and will override the settings in Roku menus. Check inside each channel's individual settings and disable captions in each. Some channels have their own captions settings that are separate from the system settings. Some channel manages their own content programming, including closed captions and subtitles on content. Reach out to the channel If changing the captions on the Roku settings does not resolve the issue.
For full information on this, you can take a look at this link: How to enable closed captioning
Regards,
Karla