How do I set up parental controls to lock channels?
To lock a channel, press Quick settings > Navigation keys up > Channel > Parental Controls, enter your PIN code, select Channel Blocked, then select the channel you want to lock using Navigation keys and press OK. A locked channel will be marked with a lock icon. (Page 9)
From the official Sony WH-1000XM4 Wireless Noise-Canceling Headphones manual, page 9
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