On my Chromecast with Google TV, some things that I say into the Google Assistant always elicit a verbal response. For example, if I say, “open prime video,” it verbally responds, “Got it. Launching Prime Video on the family room tv.” I don’t want it to say anything out loud.
I have searched through all settings in Google TV and in my Google account.
Deactivate Google assistant and microphone
Not tried myself (yet) but would a routine with a custom response work?
"Turn on lamp"
Then a custom response with just blank text or hit the space bar a few times.
Not home to test this.
It at least makes sense that if you issue a command verbally it will respond the same way.
But it's maddening that the app store search responds verbally even when I search with the keyboard.
It sounds stupid, but the only way around this annoyance was to create routines in the Home app with TWO commands.
In the Home app, I created a routine called Turn on the Red Velvet (a light) and also add a second variable that said "set red velvet to 100%". With that second command, it just turns on the light without talking.
It's a PITA to do this for so man of the commands I use, but right now it seems to be the only way to get it to just do it silently.