View > Zoom... > Fit image to window
When considering menu text, possible alternatives should surely be viewed as a user would see them. Read in full, my suggestion seems clear to me:
View > Image size... > Fit image to window
Otherwise, I would support Pierre's suggestion or my variation on it as reasonable alternatives:
View > Display settings... > Fit image to window
View > Display options... > Fit image to window
Clear communication, especially to new users, seems more important than a detailed examination of the possible meaning of necessarily brief text...
