Shift click the Slide View (Normal button) and you can jump to the slide master for the current slide. Very useful. To come back to the slide, just click on the same icon. Very useful. First Shift click goes to the current slide – layout master. ANOTHER Shift Click takes to to the overall slide master (theme slide master). Very nice. I discovered this just now! Shift Ctrl click on it gives you only the slide. Notes and thumbnails are removed. Shift ALT click gives slide layout master without thumbnails. Another Shift ALT click gives the overall slide master without thumbnails… I am sure there is more but I am mentally saturated now 
