The Notifications settings allow you to turn notifications on or off, enable pop-up or audio notifications, select an audio alert, and specify how many times the audio notification will play. 
Notifications section in Settings.
To configure sounds and notifications:
Click
Settings > 
Notifications.- Select the notification you want to configure.
- To disable the notification, click the
icon next to Enabled. - To disable pop-up notifications, click the
icon next to Toast. - To disable audio notifications, click the
icon next to Audio. - To change a notification’s audio, select a sound from the Notification Sound dropdown, then click Play Sound to hear the sound.
- Use the
arrows or enter a number in the Counter field to specify the number of times an audio notification will play.
Settings > 
Notifications.
icon next to Enabled.
icon next to Toast.
icon next to Audio.
arrows or enter a number in the Counter field to specify the number of times an audio notification will play.