I don’t think that is what @michaelcecere is asking about. I think he is referring to the Do Not Disturb on the Band itself. If you go to Settings>Do Not Disturb you get a choice of 4 selections.
What he asking is how to set the time if you select Fixed Time and where? I am also curious how to do this, as well as what does SmartMode do ? There does not seem to be any corresponding sections in the Settings section on the Wzye app. I would like to know where to set times for Night Mode, which if you enable it and go back to setting page if turns back to “Off”. I was hoping this would stop the light from coming on when in bed and not turning on when I move at night. Any insight would be appreciated.