Are you talking about the actual research/knowledge book window or the little purple pop-up that tells you the research is complete?
I've seen the pop-up spawn halfway off-screen before, but you should be able to drag it back in to the middle. I'm not sure if you can move it with the locator however, since I believe it's the same type of window that is used for the old quest object dialogues. I can look at adding a location script to it to force it to appear mid-screen for the next version.
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