Main Server Not Accesible After Adding Share

A friend recently shared a Plex server with me and I accepted. Now when I login on my phone there are two servers I can access. My original one and the shared one.

But when I login to my main Server on the desktop, it only shows media for the shared server. I can no longer manage my own. How can I switch to the main server on the Plex Server?

You select the server on the top left side. Just click on the server name of your friend.