Click the hamburger icon on the upper-left of the page, and select Notifications under Account Setup.
SYSAdmin can configure users' notification settings on this page.
Clicking on Settings beside the user name will open the personal notification settings panel. For detailed information on notification settings, please refer to this documentation.)
You can uncheck the Notify external users option to disable notifications for all External Users.
At the top of the page, Click here to set up notifications for multiple users at once.
At the top of the window, you can select groups or individual internal and external users, then adjust their notifications below.