I'd like an option to keep focus in source window when using right-click "Look up"

I often use the right-click "Look up" command to look up a word in the English dictionary (I have Collins 8th ed. as my top prioritzed one) while reading a book. The problem is that each time I look up a word, I have to click back on the tab of the book I'm reading to bring the focus back there, so that PageDown will continue scrolling as I read. I want the dictionary tab to act as just an info panel that doesn't get the focus when I look a word up in it. I don't need to be doing anything else in that tab once I've read the short definition.

I suppose it might be overkill to make the "Look up" command never bring the focus to the tab it opens the looked up word in, as there might be times (e.g., in a Lexicon) when the user would want to scroll around in that resource once it's open.

So if you don't want to make it always work this way, at least provide an option for those of us who want to make it work this way.