Samsung UN65D8000XFXZA - Manual (Page 126)

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English
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To block certain content, you select a lock, and press ENTER E (That
is, you “click it”.). For example, click the 18+ lock and you block all TV
programs rated 18+. The rating categories are also grouped so that
clicking one category blocks all the categories a parent would block
along with it. For example, if you block the G category, then PG, 14+
and 18+ will automatically be blocked.
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To unblock a category, click the lock.