Hello Seema:  There are two players in Articulate Storyline 360:  Modern and Classic.

When you select the Modern player, Storyline 360 automatically formats your responsive course with a range of options/views:  desktop, tablet landscape, tablet portrait, phone landscape, and phone portrait.  These various views illustrate exactly how your course will appear when viewed on a desktop, tablet, and phone.  360 is a very different product from Articulate 3.  If you use Storyline for all of your course production, I think it would be a good investment to make the jump to Storyline 360.  You won't be disappointed.

Kind regards,
Robert