Having trouble with different focus modes, and setting them up

Hello.
I have one question.
I have configured my sleep focus mode to go off every night at a particular time. Whenever the focus is active, I have notifications still coming in from messages, mail, WhatsApp,etc. I have both critical alerts and time sensitive notifications turned off.
I thought there was a way to silence All incoming notifications from people and apps.
Is there any way to select all of the contacts at once under the ad people screen, or would I have to add people individually? The same goes for apps.
Just a little bit confused because I know with some apps, I would like notifications.
I also see this behavior under the do not disturb focus mode. I have turned off the share across devices setting.