Post #3 takes you to the basic over all setting
AND for even finer control, you can do by source. This allows you to cherry pick.
Same steps as post #3, but, select the source on the left: then click Configure selected source
Also note: not ever source offers a full set of metadata. If you narrow the available sources, your success rate drops. Calibre merges from what it gets.
Another cause for failed metadata fetches: is the wrong IDs {identifiers} are set.
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