The default in Robert’s Rules is for votes to be either simple or super majority of ballots cast.
It is an anomaly from Robert’s Rules that the ELCA Constitutions require that votes to leave the denomination require a super majority of “members present”. If the “members present” phrase is not in the Kiwanis By-laws, nothing to worry about.
Nothing in our chapter’s by-laws (which have been approved by International) states anything that conflicts with ‘members present’. I then take it that ‘members present’ is operative.