Am I overlooking something mad? After switching to 2.92 I can only use X-Ray in solid and wireframe modes. I see “X-Ray not available” in the other two. Has that always been the case?
You’re not mad… previously it just had no effect.
But don’t worry, just go into edit-mode and you’ll see it again. 
Good luck!
Thanks. I didn’t know what was happening… 