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The user interface may be different than my S21. On my phone I can swipe up from the bottom and then choose to close all.
There may well be another means to shut down an app but I always slowly swipe up from the bottom of the display which then shows all of the apps running. Scrolling left and right you can tap on a running app to bring it completely open or close all. I use the close all option when shutting down my music streaming service.