2 windows 10 installs on same computer - 2 Plex servers - 1 info/data source?

You’re not blind. It was discovered to be a security risk if I recall. So now the location has to be modified in the registry.

I think the info on how to is in the support articles.
(Sorry on mobile at moment so difficult to link.)

EDIT. Think this is it At least the regkey part.