When working on a page in Limecraft Workspace that contains a player, you can toggle the subtitles on or off, provided they have been created in the Subtitle Editor.
Toggle the Subtitles on or off in the Limecraft Player
If subtitles are available, you can toggle them on or off using the cogwheel icon at the bottom right of the player. If there are multiple language versions, you can select the desired subtitle language from the same menu.