Geocoder configuration form shows up on address field instead of on Geofield

hey ... @ducdebreme thanks for reporting this.
BUT why do you assume this is a bug?
Do you have clear evidence of that?
Do you provide it ... ?
Or do you simply feel things don't work as you expect?
Well, that is not a clear bug ... but probably something that you missed or misunderstand.
Please don't provide Issues marked as BUG, when you don't have (and provide) clear evidence of that.
Rather create Support requests, that could be eventually turned into Bugs, when confirmed.

Indeed in this case you are simply mislead.
If the geocoder_address submodule is enabled, Address field can be indeed:
be Geocoded from an existing field
or Reverse Geocode from a Geofield type existing field.
(as mentioned in your screenshot itself).

Automatically closed - issue fixed for 2 weeks with no activity.