Hello!
Gerrit local instance, version 3.7.3, installed code-owners-stable-3.7 plugin
(Loaded plugin code-owners, version 62dfffa2d7)
I configured code-owners plugin in such way:
etc/gerrit.config:
[plugin "code-owners"]
disabled = true
And now I can see this warning in UI for every project's changes:

It makes it impossible to use the plugin on our production instances with hundreds of projects/teams - we want to enable it only on subset of projects.
We had no such issue with version 3.6 of the plugin - we had "Owners" row in changes only for projects with enabled plugin.