With Windows 8.1, Microsoft has secretly changed the behavior of Modern apps when you close them. In Windows 8, when you dragged a Modern app from the top edge to the bottom edge of the screen, it got closed. But in Windows 8.1, when you do the same, you will be surprised - that the app does not get closed; it remains in the Task manager! Windows 8.1 keeps Modern apps in the "suspended" state when you close them. In addition,But it's not all bad news, you are still able to close apps completely with a mouse gesture or swipe. Let's see how.
Step one.
Move you mouse to the top most edge of the screen where the pointer turns into a hand. If you use a touch screen device, then swipe from the top edge to the bottom.
Drag the app down, but do not release it!
Step two.
Hold the app dragged to the bottom until the app's thumbnail flips. Now you can release the thumbnail.
Finally, the app is closed! The proof of that is this time, the app disappears from the Task Manager and from your Alt+Tab/Win+tab lists, indicating that it is truly closed.
