I understand why you would want this, but there is in fact no setting for this as Imagevue centers images and thumbnails based on margins and content area. It would be a bit complicated if it was to also move in one direction still taking into consideration these settings.
Personally, I am on a 13" macbook, and I wouldn't appreciate it if the image was moved away from the center of my screen. This is a screenshot from how I see it now:

I think it would not be comfortable if the image was further moved down and right.
I was about to suggest a few workaround, but I figured out they are just bad suggestions with adverse effects. We can check for next major release if we can add some offset settings, although I am not quite sure if this will cause a lot of complications.