Go to Settings > Sound and Vibration > click on volume > click three dots > click the option in drop down menu > and slide the bar to all the way to end.
Hope your Problem gets solved. If not, Contact Samsung Costumer Support.
If you like this answer, pls accept it as solution by clicking on three dots beside my comment
Go to settings -> sound and vibration -> sound quality and effects -> make dolby atmos 'On', Equaliser -> Balanced, Loudness normalisation -> turn 'Off'
