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Just here to explain a pretty similar case.
Running ISE version 3.3 patch 7 and as an Internal User, basically having Super Admin role, but not able to see a lot of different menus: For example : Context visibility was not visible and Policy Elements...
Hello ! Here I found a way to remove / delete a device from the Fabric : Provision / Fabric / Select your device / Fabric / Remove from Fabric If DNA Center tell you that some interfaces are still used : Go to : Provision / Fabric / yoursite / Host O...