Thank you for your solution. I could have about slapped myself for missing this on my own, but these things happen I suppose.
It is curious though that what you described is not what I saw under Preferences ---> Behavior. I was able to disable the internal viewer, but had to do so on an extention by extention basis. Moreover, there was no checkbox to mark to select the system's default ebook viewer. This leads me to wonder if we have different versions of Calibre or are on different O/S's? In any case, I thank you for your help!
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