What is one channel
You no longer need to worry about managing channel lists for each individual signal. The single channel display feature allows users to edit and list the channels of their choice from any of several broadcast signals (digital, analog, or radio). This is convenient and allows you to create one channel feed.
But as a rule, very few people use the TV to listen to the radio.
And if the house has cable television, the use of broadcasting is not necessary.
This feature is available but most likely, most users do not use the One Channel Map.