How do I access the 360 guide while on XB1?
With Rare Replay, it includes the 360 versions of some games to “show off” the Backwards compatibility in action. I can get 360 style notifications and achievements, but pressing the xbox button brings me to the XB1’s home instead.
How do I get the 360 guide to show up? It was advertised as being able to do so.
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You can call upon the Xbox 360 guide by pressing both, simultaneously, the View and Menu buttons (the new Start and Back buttons). See here for a controller layout reference.
Reference: Xbox One Backwards Compatibility FAQ