Oh, you meant the “Bad Server (Thailand)”, got it. Just visit https://app.plex.tv/desktop/#!/friends page you will need click on your Friend profile who shared the library access with you.
Click on their Profile Picture > Click “Library Access” button > Under the “You have access to:” section click on “Edit” and press on “Leave Server” button.
It appears this is a leftover from the time when you temporarily lost your account.
The shared server has now been removed. If you reboot your clients or switch user accouts back and forth it should be gone.