Switching and closing apps on the Galaxy S5 is different than on the Galaxy S4. Now, long-pressing the Home button pulls up Google Now instead of all open apps. If you want to quickly switch between Facebook and Angry Birds, or just look at all the apps you have open, you’ll want to use the new soft key on the Galaxy S5. Here’s how.
1. Tap the soft key to the left of the home button below the screen.
2. Hit the app you want from the carousel of open programs.
4. Swipe an app’s thumbnail to the left or right to close an application.
From this screen, you can also look up the memory use of each open program and close all running apps by tapping the buttons on the bottom left and right, respectively.