This is how I have been using the orange button.
If the evidence is definitely not sufficient to confirm the species (specific key features are not visible) and there are other species in the area that cannot be ruled out, the ID should not be at species level. The orange button pushes it back to genus. The green one does not.
There have been some previous discussions about the wording and whether it expresses what it is intended to, e.g. here: https://forum.inaturalist.org/t/doesnt-inat-commit-a-basic-logical-error-when-an-identifier-suggests-a-higher-order-taxon/44144