How remove/hide an action field link? On a node field form (admin/structure/types/manage/article/fields), I have a dropdown with action links for all fields.


Edit
Storage Settings
Delete


I would like know if it's possible to unset the "Delete" link for a field please.
I have try with hook_link_alter() but I don't know how find and remove the link for a specific field (by example field_image).

Thanks.
Assuming those operations check access correctly (not doing so would be a bug), you can use hook_ENTITY_TYPE_access, e.g. in your case hook_field_config_access, there you can deny delete access for a field with a given name.