Samsung LT27A750ND-ZA - Manual (Page 115)

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English
N
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.
N To unblock a category, click the lock.