Hi,
Just for the sake of completion.
If you have a rule for disabling all the notifications then the “Reset modified attributes” will not enable the notification for the service/host.
For doing the same you should enable the “Enable/disable notifications” permission instead.
A new action (for a host) or command (for a service) “Notifications” will appear and you can toggle them from the service page or in bulk if you display checkboxes.
Related werk Disable dangerous commands on hosts / services by default