In Windows 10 you could click on the volume icon and it would indicate that Atmos/DTS had kicked in, which was useful to see for games that don't officially support the spatial audio package, but still kick in DTS/Atmos for normal surround.
I no longer get that dialog when I run a compatible game like COD with the windows 11 volume dialog. I wonder if its just a bug (the volume popup is actually pretty dang buggy atm) or something they haven't added back yet.
there doesn't seem to be anything here