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The only way is to turn on AutoMerge in Preferences ->Adding books. Choose the behaviour you want from the dropdown as to what you want to happen when it detects a duplicate.
You will still get a dialog popping up after the merge that you cannot turn off unfortunately. I say unfortunately because it is about as useful as tits on a bull - telling you only the title of a book without the author or formats merged etc. Plus since there is no "undo" or review process the dialog is shutting the gate after the horse has bolted anyways.
Likewise if you have automerge turned off (which I would never do, as I disagree violently that duplicate matching only on title is in any way useful), then the dialog is next to useless, telling you only the title and not the author so you have no idea if it is correctly detecting a duplicate or not to make a decision to merge it. In most circumstances you are better off telling it to ignore the duplicate and create the new record - after all the risk of not having a book added to your library just because the title matches one by another author is not particularly useful imho.
You cannot turn off all duplicate checking completely, at least not without modifying the source.
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