It is very easy to close a running metro app or apps that are running in the background in Windows 8. You have three methods to close a running app. First method: If it is a running app, just click and drag it from the top edge of the screen to the bottom of the screen.

Second Method: If it is a background-running app (i.e. not in focus app), right click its thumbnail in the Switch List (hover your mouse at the top left of your metro screen to view Switch List) and select “Close” from the context menu.

Third Method: Open task manger (Ctrl + Alt + Del) and under “Process” tab, right click the app that you want to close. Then select “End task”.

Press Win + I key and select “More PC Settings”. In the left pane, select “General” tab.

Then, under “App switching”, click “Delete History” button to delete app history and clear the Switch List.