How to hide and unhide interface in 360° Player

To hide the interface in your 360° Player, click the eye button located at the bottom of the left-hand navigation, between the Sketch tab and the Tutorials button:

 This will provide you with a clear view of the 360° Player without any additional interface:

Press the "Esc" key on your keyboard or click the "ESC" button in the upper right-hand corner to unhide the interface.