Every teammate can change their own notifications via their personal account settings. To change your notifications, follow the steps below
1) Steps to enable Notifications for Site :
a) Click on the Lock icon in the left of the url bar.
b) Enable Notifications for that site.
OR
2) Change your Browser's Default Notification Settings-
3) Steps to enable notification for the Browser in your system
Windows :
a) Select Start > Settings > System > Notifications.
b) Enable the Notification for your browser.
Mac OS:
a) Choose Apple menu > System Preferences, then click Notifications.
b) Select the Browser in the left column.
c) To change the notification style, select Banners or Alerts or select None.