Silent mode (no tones)

I want to set a "silent mode" on my Epix Gen 2. I want Smart Notifications and Alerts to follow settings that allow them to display on the screen or vibrate ... but for the watch never to beep in "General Use".

System / Sound and Vibe / Alert Tones ... no toggle

That's set to "On" with no chance to set to off.

Every other item there has a toggle button.

Is that a bug, or is there some other way to simply silence the watch without affecting display and haptics?

Many thanks for suggestions.