You can disable notifications/sounds under Options » Interface » Notifications.
You can comment this FAQ
Comment of Dave:How do you disable the animation when the download begins? Added at: 2017-09-06 03:15
Comment of vanessa:where is the option button ???? i want to disable the pop up animation that wont ... show morego away Added at: 2018-07-22 04:20
Comment of Johan van Voorst:Disable ALL irritating and far too big notifications Added at: 2018-08-29 15:14
Comment of Tharsanan:1. go chrono settings
2. go to interface tab
3. under notification section you can untic "Show download ... show moreprogress" Added at: 2019-05-27 01:54