“Applications that you install from the Windows Store don't slow down your PC, so you don't need to close them. When you're not using an application, Windows will leave it running in the background and then close it eventually if you aren't using it. But if you really want to close an application…”

Watch this video…

Close an App in Windows 8

How do I close an app?

Get more help and support for Windows 8

Rob

PS its the same for Windows RT

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