Explanation
Campaign Status is a standard picklist field on the Campaign object that indicates whether a campaign is planned, in progress, completed, or aborted. Campaign Member Status is a custom picklist field on the Campaign Member object that indicates how a person responded to a campaign, such as sent, responded, registered, attended, etc. To add a new picklist value for Campaign Status, you need to edit the field in Object Manager. To add a new picklist value for Campaign Member Status, you need to modify the field on the Campaign Member Statuses related list on the Campaign page layout. References:
https://help.salesforce.com/s/articleView?id=sf.campaigns_fields.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.campaigns_member_status.htm&type=5