Best answer by SHARKB8T
For a variety of reasons, the PlayBar is the centrepiece of the TV audio system and so it seems more accurate to say that you need to remove the Surrounds (the 1s) and remove the SUB from the PlayBar.... and then bond the SUB to the 1s if you want it in their mix. Then to watch TV with it all... remove the SUB, bond the SUB back to the PlayBar, assign the Play1s as surrounds...
Yeah... That may be a bit of a drag to do often.
I presume you have gone into the app under "surrounds" for the room and set the 1s to play "full" when you listen to music? If not, that will make a big difference to the music audio listening experience.