Why are WSUS shared folders shared out to entire network?

I set up a Server 2012 R2 instance as a WSUS server and went through initial set up. But now, from another computer on LAN, when I type explore to the server via UNC path I see Wsuscontent and WSUSTemp shared out to the whole network. The odd thing is when I look at properties of these folders on the server itself it says the folder is not shared. Yet when I load up Server Manager->File And Storage Services->Shares I see these folders as being shared.

Why are they being shared in this way and why is the shared state not being reflected in properties?

Also, is this a security risk? If so, how would I go about locking this down? What is recommended best practice here?

I appreciate any insight. Thanks.