To customize the campaign member status picklist values themselves, marketing users need two things: a marketing user feature license and edit permission for campaigns. A marketing user feature license enables users to create, edit, and delete campaigns; manage campaign members; and update campaign history via the import wizards or API. Edit permission for campaigns allows users to modify existing campaigns and their related records such as campaign members and campaign member statuses. References: https://help.salesforce.
com/s/articleView?id=sf.campaigns_enable.htm&type=5https://help.salesforce.com/s/articleView?id=sf.
campaigns_member_status.htm&type=5