Open the Roku playback language panel
While the performance is playing, press the star button on the Roku remote and open Accessibility & language. The medici.tv guide says to set Subtitles to On always, then use Subtitles track to choose from the available languages.
Selecting a preferred track and enabling its display solve different parts of the task. If a language is listed but no text appears, check the subtitle switch in that panel before changing the entire Roku or medici.tv interface. Record which programme is playing when making the change.
Understand what the saved choice controls
The guide says the chosen subtitle language becomes the default for subsequent videos where that language is available. It explicitly says this does not change the language used by the medici.tv Roku application itself.
For example, English captions on one opera and French navigation labels can be a consistent configuration. Changing the caption track is not a translation command for the menus. Likewise, a later film lacking that caption language does not prove the earlier preference was erased; inspect the later film’s available track list first.
Choose a suitable performance before a planned viewing
medici.tv says an absent language or empty track list can mean subtitles have not yet been added to that film. A remembered preference cannot generate missing text. For an opera evening or language study session, inspect the actual programme’s list rather than relying on a subtitle choice made for a different recording.
If a listed track still fails after enabling subtitles, report the performance identity, chosen language and Roku app context. Distinguish missing text from incorrect language or unchanged menus. Those observations let support investigate the actual subtitle problem without conflating it with catalogue access or expecting a new subscription to add an unavailable translation.
Questions about this guide
Does the subtitle selection change the app’s menus?
No. The Roku guide explicitly separates the subtitle language from the app language.
Will the default apply to every later video?
Only where the selected subtitle language is available.