In Google Inbox I was looking for &quot;mute&quot; the other day in the mobile app.  Couldn&#x27;t find it anywhere.  Turns out it&#x27;s a long-press on the normal &quot;done&quot; button (the checkmark), which I found by Googling.  I never would have found it on my own, but now that I know about it it seems convenient and intuitive.