Here I see what you did but it's not supported (the secret menu.)

However there are issues with the YouTube app such as it's been discontinued much to everyone's dismay. But about NETFLIX. I often have to look around the menus in Netflix to change the audio output to optical and often have to select the Stereo or PCM audio track. THIS is not documented in a web page so I have to stop here. But it's what I've found works for most of the time.