S7 how to rotate screen?

Tried to watch a movie on airplane, but, my S7 would not stay in rotate mode… meaning, holding it sideways so I can view larger screen. How do I do this, please?

I don’t have an S7 but found this link that might help you: http://eguides.sprint.com/support/eguides/samsunggalaxys7edge/content/samsung_galaxy_s7_edge_ug/portrait_and_landscape_screen_orientation.html

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