Guerrilla Games has detailed the various accessibility features present in Horizon Forbidden West.
Some are automatically enabled upon starting the game, but you can change things around such as the controller layout, and you can also choose your difficulty setting.
One of the accessibility options included with subtitles, is the ability to change the size and background used with subtitles for better visibility. You can select your preferred language, both spoken and subtitles when starting the game for the first time.
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