If you want to come out of the pinned screen, touch and hold the back and Recent button at the same time. (phoneradar.com)
Below the screen sits a physical home button, which only juts out from the top of the frame by a fraction of a millimeter, and is flanked by a back button on the right and an overview recents button on the left. (androidheadlines.com)
Multi-tasking performance is equally as good, especially since Samsung is using the overview / recents button in place of the antiquated menu button, which brings up the multi-tasking interface with a single press. (androidheadlines.com)