I like to use
the whitelist mode to mute everything except YouTube (the extension button lets you add entire domains to your whitelist with just a click).
Not exact matches
There is a gaming
mode which disables heads - up previews and rejects calls automatically, except those from
whitelisted contacts which are answered automatically in hands - free
mode while gaming.
Fortunately, you can also
whitelist specific apps you want syncing as per usual while still making general use of Data Saver
mode.
You can also enter the full app settings page where you have even more control, including
whitelisting the app to notify you even when Do Not Disturb
mode is on (but more on that later).