If closed captioning appears unexpectedly on a Roku, or if it appears even when you think you've turned the feature off, we'll explain how to make sure you can watch your Roku without subtitles.
ROKU TV Device: How to Turn Closed Captions On or Off (Words on Screen Remote CC)
There are a few reasons why your Roku might show closed captions when you least expect it. The most obvious reason is that system captions have been turned on intentionally by someone other than you. This could be another user of your Roku, but it could also happen during a channel or system upgrade.
Additionally, each channel on your Roku device may also have its own closed caption settings that override the system-level settings. So disabling closed captions at the system level, but enabling them at the channel level, would also be responsible for them appearing unexpectedly. Someone may have even inadvertently enabled them for your current content when using the playback controls.
You can turn off closed captioning on your Roku device for good with a few simple steps. Start by checking the system-wide settings, or alternately, in the channel settings. Finally, if these seem to be set up correctly, you can always reset your device.