So you're an Office 365 administrator and you've granted yourself, or someone else, "Full Access Permissions" to another user's mailbox — either in Exchange Management Console or in Exchange Admin Center in the Office 365 Portal. You did this because you needed to access the user's mailbox to receive something or work on an issue.
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I was just fooling around with an On Prem installation of D365 and I created a custom app to test out converting the legacy Web Interface application into a Unified Interface application. When I was done testing, I wanted to remove it, but I saw no where in the App Designer to do that.
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