Actually, it’s more a redesign, but as part of the refactoring process, I also integrated group support to the Entity Explorer. And this led me to this new layout (left:new, right:old):
As you can see, the components of an entity are now listed in the lower table view. The tooltip of the class column shows the whole package name. This way, one can easily see, out of which components an entity consists of. It’s still not a 100% finished yet (e.g. deleting components is missing), but I think you can get the idea where it’s going to!