You might be able to just change the mode in the player.
When you start a video you might have a mode option, and it brings up several options, so that you can choose how you want to see it. I just got my vr gear yesterday and it was the first thing i had to figure out. Its pretty easy, just start the video in the headset and and while the play pause options are there look for mode.
Sent with my white Note5 with nonremovable back and no SDcard!