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Select EcalBarrHits from the lefthand menu.
This view shows one record for each hit in the "EcalBarrHits" collection. These hits are objects of type SimCalorimeterHit. All of the Calorimeter hit collections (including both endcaps and barrels) are decoded in an identical fashion, so the Hcal and Muon collections will look quite similar.
Not all of the fields may make sense to you, but ones to notice for Calorimeter hits include layer, which is the logical subdetector layer of the hit, energy (e.g. the raw, uncompensated energy deposition) and position (X, Y, Z).