Comparison between before & after

Is it possible that when comparing the before and after pictures the “Fit” could be set to a preferred position? I like to see the full pictures compared side by side and always have to change the “Fit” drop down box from 100% to read “Fit”. It’s a pain to have to change it for every photograph.

I think the Shortcut keys may be the best option for this, you can find a list of all Shortcut keys to control the display of the image in Preferences > Shortcuts > View