I have the Soundbar Pro connected to TCL Roku TV. As of today the sound settings menu is empty. 1 selection, Reset Normal sound settings. I have unplugged and plugged it back in, same issue. Just used the setting a few days ago. All was ok. Started using sound bar Jan 22.
Try playing something, then hit the Option * key, if you go to Audio in the settings, there's box telling you this.
I was having the same problem with my Hisense roku tv, I just checked for system update, went from 10.5 to 11, and now my audio menu is back again. Try checking for system update