Samsung UN50ES6100 E-Manual page 199

For example, click the 18 ans+ lock
and you block all TV programs rated 18
ans+.
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 8 ans+ category, then 13 ans+, 16
ans+ and 18 ans+ will automatically be
blocked also.
N
To unblock a category, click the lock