There is no way to set your Google Assistant volume separate from the Soundbar's TV/music volumes.
This means that if you muted your TV before last switching it off, you can barely hear Assistant (though it appears at least to have a minimum volume).
And it means that if you last listened to your TV at high volume and go to interact with Assistant late at night, you likely will wake up your whole household.
There was a thread on this which Sonos closed a year ago. At that time, people were complaining Sonos hasn't done anything about this known issue for two years.
Why are we even wasting our time with feature suggestions, if Sonos won't take one which already should have been obvious anyway?