How to add 2nd vCenter Instance to show up after logging into 1st vCenter Instance


In my environment I have 2 vCenter instances in 2 different physical locations.  When I log into the 1st vCenter instance through VMware vSphere Client, I also see my 2nd vCenter Instance with it's Hosts and VM's.

My question is, how is that possible?  Usually you would log into your vCenter Instance and only see 1 vCenter Instance.  How it it possible or set up to show the other vCenter Instance.  I dont see any options to Add a 2nd vCenter instance after logging into the 1st vCenter Instance so I'm not sure how this is possible to see both vCenter Instance after only logging into the 1st vCenter Instance.  I did check to see the licensing, and it shows that the license used is registered for 2 vCenter Instances.  Would that be the reasoning behind when I log into my 1st vCenter Instance, that it also shows the 2nd vCenter Instance because it's using the same license?

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