A few firmware updates ago Amazon modified the X-Ray interface, making it a lot more complex and, in my opinion, a lot less useful. I wonder if your Paperwhite didn't have a recent firmware.
I don't have an Oasis but I have a Paperwhite 1, 2 and 3 as well as a Voyage. X-Ray hasn't been updated on my Paperwhite 1, or at least it wasn't last time I used it. I rarely use X-Ray anymore.
Barry
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