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hippy
@grams
Shimano's name for it Gear Position Control and you can turn it on or off but only if you tell it you have a 53/39, otherwise it's always on:
https://bettershifting.com/di2-cant-shift-to-smallest-cogs-in-small-ring-adjust-gpc/
If you have first gen 11 speed (6870 or DA9000) it doesn't exist.