ADFS 3.0 2012 R2 - I need help identifying my farm federation servers and if safe to remove old ones.

Hi

I inherited our ADFS infrastructure with little documentation, and I am trying to identify how everything i working together. I have a document of the layout, so I know server named and purposes, but I immediately became confused, as the layout shows a Productionfarm behind a load balancer and a DR farm behind a DR load balancers, two totally seperate farms it appears, but when I log into one of the DR federation servers, they show they are getting all their data from the Primary Federation Server on the productionfarm.

So I set about googling how to see the farm members on the Primary ADFS Server, and I cannot find ANYTHING to look that up, and to see what all federation servers are in the production farm. I found a powershell command but I think it started in Serevr 2016,so that was no good.

Can anyone tell me how I can see what all servers are in the farm on the primary federation server, and also if removing a server from the farm is as simple as just removing the ADFS component in Server Manager, on the secondary server?

Thank You so much, I am not ADFS trained, and am only taking it because I have to. I am trying to read and understand, but I am still quite confused about how the trusts and all that work. So please assume I am a total newb in your reply, especially if partof the decomission is to do cert work or share work.

Thank You so much for any help!