Focus Assist can be used while we are in an important client or team meeting, while sharing our screen, using an app full screen, or during specific hours. We can tell Windows to hide all notifications while still filtering alarms or anything deemed high priority. 

Focus Assist can be turned on and off relatively quickly and there are three main options from which to choose.

• Off: This disables Focus Assist completely and enables all notifications.

• Priority only: Enables notifications from a customizable list of contacts.

• Alarms only: Disables all notifications except for those associated with alarms.

Here's how to get started.

To activate Focus Assist, go to Settings > System > Focus Assist and make a selection or else just type Focus task's search bar and select Focus Assist.  

• An option under the Focus Assist settings page called Show me a summary of what I missed while focus assist was on controls whether or not you see missed notifications in the Action Center. 
• Check the box for this option if you want to see everything you missed in one location.