This article explains how to close apps on an Android device from the home screen. It also includes information on closing apps from the app manager and closing running services,
How to close apps on Android (Samsung Galaxy)
Closing apps on Android means closing the apps. You can close an app if it is not responding normally, if your phone or tablet is low on memory, or to clean up the screen.
The fastest way to close running apps is to close them from the home screen.
Start by viewing all active apps. How you do this will vary depending on your phone and Android version. If you’re not sure how your device displays active apps, try the different methods available: