Windows11 (23H2), display resolution 3840x2160, win scaling 150%
Shortcuts - zoom
Once you start zooming, default shortcuts do not allow you to return to the default state - 'Fit image to window, large only' (aka 'Best fit').
Some other apps have such shortcut:
Suggestion
- reassign / key
 from 'Fit image to window'
 to 'Fit image to window, large only' (aka 'Best fit')
 
 so user can always return to the default state
Related
- suggestions
 Shortcuts - general - assign F1 to About
 Shortcuts - zoom - reassign / key to 'Best fit' (current post)

