I am not sure if my suggestion would help, but when I am processing images in the darkroom I often move onto the next image I want to see by using the filmstrip in the darkroom rather than returning to the lighttable.
Out of interest, what advantage do you use the second screen for? I know in GIMP when I am restoring photographs I may open a second screen to show the whole image to look at the effect globally while repairing scratches and spots on the main screen zoomed in.