Thanks for reaching out regarding the issue you are experiencing.
For more information about enabling/disabling closed captioning, visit our Support page here: How do I enable closed captioning?
However, 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 its own content programming, including closed captions and subtitles on contents. Reach out to the channel If changing the captions on the Roku settings does not resolve the issue.
We hope it helps!