This is an alternative to the current back and menu gestures which are shaped like this < and ^.
1) Go back gesture: On the bottom right side of the screen flush to the edge, simply swipe down while holding the S-Pen button, this will trigger the back button soft key.
2) Menu gesture: Similarly, just swipe with the S-Pen pressed on the bottom left side of the screen.
Although this is ultimately the same as the other gestures, I find this one MUCH easier to get used to rather than the awkward backwards arrow. Hope you enjoy this tip