Dolby Digital Plus 5.1 in Settings but not seeing Dolby Atmos indicator. TV is Sony XBR75X850E over HDMI ARC. Content is El Camino 4K on Netflix. What does the indicator look like?
Why The Partial DTS Support : r/sonos
DTS Compatible Sonos Arc, Beam, Beam Gen 2, Playbar and Amp
How to Get 5.1 Dolby Surround Sound from a SONOS PlayBar or PlayBase: BigPictureBigSound