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I'll refer you to this previous conversation on the same topic:
https://community.appian.com/discussions/f/general/19410/how-to-identify-unused-objects-in-application
NOTE: I've been told that the scope of the view of such objects is actually the other way around - it will be at the individual Application level, not the Environment level. Please note the caveat as to when this may be available and what the actual functionality will be.