The app stays active and visible on your device screen.
Press the device Home button to return your device to the home screen. The app is not active and does not give notification warnings and sounds. Eventually your device's operating system will close the app.
Tip: When overlay mode is on, pressing the device Home button or Back button puts the app in the background and shows the overlay panel. The app stays active and continues to give notification warnings and sounds.
To close the app from the overlay panel, select the panel to open the quick-access menu, then select Close app.