This article provides more information on how enable the multi-stage environment.
SAP SuccessFactors Recruiting Management
Please, refer to this documentation: Implementation Guide: Multi-stage Application
2343932 - Application - Implementation Tips & Tricks from Support - Recruiting Management
Multi-Stage; Enabling Multi-Stage; Enable Multi-Stage; Multi-Stage Application; , KBA , LOD-SF-RCM-APP , Applicants and Job Applications , How To