When creating a geolocation field group, it is always recommended to first add the Geocoder field. The Geocoder field is a hidden field and will not be seen by the front-end user. It comes with different field options and Its main purpose is to sync between the other geolocation fields and to hold the geocoded information. After adding the geocoder field, it is recommended to give it a unique label. When settings up the other geolocation fields and syncing between them you will select the Geocoder field using its label.
Setup the map marker options which will take place when a map is synced to the geocoder field.