Samsung How to Set Notification sounds for individual Apps

In contrast to the normal Android, on Samsung devices with One UI, the notification sound can be changed for each individual app, but this only works if the app requests appropriate rights for notifications. For example, the notification sound cannot be changed generally for (Facebook) Messenger, but must be changed individually for all notification types (chats and calls, group chat, stories, ...). In addition to the notification sound, the vibration or the display of a pop-up window can also be adjusted.

Note: To change the notification tone of an app, it must not be muted, and the app must have changed a notification before.