Users are not able to update email settings, the update button is not available.
Release :
Component : 4.x
This is because the monitor service is running and then setting cannot be re-defined.
1. Navigate to Configuration < Monitor
2. 2. click on Monitor Legacy Tab < Click on Stop Button
3. switch to the General Monitoring Parameters tab < update the details
4. Click on Update Button < switch to Monitor Legacy tab
5. Click on the Start Button.
6. Navigate back to general monitoring parameters and check if the details updated successfully.