Turn off toast notifications This policy setting turns off toast notifications. If you enable this policy setting, applications and system features will not be able to raise toast notifications. Note that this policy does not affect taskbar notification balloons. If you disable or do not configure this policy setting, toast notifications are enabled and can be turned off by the administrator or user. No reboots or service restarts are required for this policy setting to take effect.

(1) GPO: User Configuration\Administrative Templates\Start Menu and Taskbar\Notifications!Turn off toast notifications (2) REG: HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Windows\CurrentVersion\PushNotifications!NoToastApplicationNotification