Yes, I'm talking about the the overlay-plugin: https://www.dokuwiki.org/plugin:overlay.
For a longer time I played around with that option and as far as I understand it servers a different purpose, than I have in mind. If I add an asterisk to a namespace, the intended overlay-window is not shown:
Example:
There is a overlay.txt in ":rem:m-ma:07-zuordnungen-dreisatz", which is shown, when I view a page of this directory. If I view a page of a subdirectory for instance ":ma:07-zuordnungen-dreisatz:zuordnungen-einstieg-gps-tracks:start.txt" then the default overlay-page of "plugin»overlay»page" is shown.
For "plugin»overlay»nsoverlays: " I tried
":rem:m-ma:07-zuordnungen-dreisatz"
":rem:m-ma:07-zuordnungen-dreisatz:"
":rem:m-ma:07-zuordnungen-dreisatz"
":rem:m-ma:07-zuordnungen-dreisatz:*"
No entry brought up the overlay-page of ":rem:m-ma:07-zuordnungen-dreisatz" when viewing ":ma:07-zuordnungen-dreisatz:zuordnungen-einstieg-gps-tracks:start.txt"
For me, this sounds like an error, but maybe the plugin should serve a different purpose and thus is behaving different from what I expect.