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Not that I am aware of.
Just because a layout page is not in a Publisher Set does not mean that it is not being used.
It could be printed directly from the screen (FILE menu > Print).
I don't use the revision and issues systems - so not sure if there is a way to list an index of current layouts.
I think you mean Master Layout, you can select 'tree by master layout' at the top where it generally defaults to 'tree by subset'.
The Master Layout in use has a fold down option
Those without the option are not currently in use.