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Just the obvious: manually alter the file where the viewer keeps the position information - assuming there is such a file and that its in a readable form.
But there should probably be a "reset GUI to default" function within calibre and the viewer in case something like this happens again. (I'm assuming that calibre's GUI can be altered in a similar manner.) Probably a context menu function to the main window as it cannot be dependent on the menu/toolbar.
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