Choose the film, then choose its language edition
A film’s original language tells you how the production was primarily made. It does not promise every available dub or subtitle track. Start with the correct title and year, then inspect the language choices in the viewing edition you select.
Subtitles on another screen
Before settling into a film on a television, test the subtitle track there. A phone player, a casting connection and a native television app can expose different controls. Look for caption size, background and language in the device actually showing the video.
If the text is out of sync
Check that the subtitle track belongs to the same film cut or series episode. A timing offset that stays constant may be adjustable in a player that supports subtitle delay; text that drifts further apart can indicate a different edition. For a mislabeled episode, compare the episode title before attempting to correct timing.