Quote:Windows 10’s Focus Assist feature temporarily hides incoming notifications. In Windows 10’s next update, Focus Assist can activate when you’re using any full-screen app, whether that’s YouTube in a browser, Netflix, or a desktop video player like VLC.

This feature will be part of Windows 10’s upcoming update, codenamed 19H1 and expected for release in April 2019. Microsoft just added this feature in Insider build 18277, released on November 7.

“Focus Assist” was added back in the April 2018 Update. Windows 10 can automatically enable it when you’re playing a full-screen game or projecting your display, or even just between certain hours. It’s like a “Do Not Disturb” mode for Windows 10. When you disable Focus Assist—so, when you stop playing a game or watching a video—any notifications you missed will be summarized for you. This is all customizable.

Full reading: https://www.howtogeek.com/fyi/windows-10s-next-update-will-hide-notifications-while-you-watch-videos/