Of course it only activates in its proper Q&S library. The menu icon is non-responsive until the current library is validated as a Q&S library. However, even if it did activate, it would not do anything, since it does nothing until a job is started, and the jobs would all fail due to SQLite operational errors due to missing tables and views.
The user admitted to being incapable of following instructions, so what he did and how he did it is unknowable. He might have taken a Q&S metadata_db_prefs_backup.json file (which is highly specific to Q&S) and copied it into his standard Calibre library folder. That for sure would break some functionality that he previously had. Did he do that? Who knows?
Whatever he did that he should not have done, or did not do what he should have done, he did not follow the detailed instructions; the outcome is clear.
DaltonST
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