How to get rid of random "ghost" monitors and weird behavior with graphics adapter

I had the same issue, which I previously attributed to connecting to various TVs in different meeting rooms. However, it appears to be related to Hyper-V; when I removed Hyper-V from the system the problem was immediately fixed.

Try reinstalling the Intel HD Graphics driver to older version specifically 15.40.4.64.4256 -- https://answers.microsoft.com/en-us/windows/forum/windows_10-performance/windows-10-multiple-non-existent-screens/541f1815-de00-47a2-b638-5c0a6fdb01a4