Once you add new Status in a Status set under Edit Applicant Status Configuration, the status greys out.
SAP SuccessFactors Recruiting Management
Reproducing the Issue
Admin Center >> Edit Applicant Status Configuration >> Add a new Status.
Once you add the Status greys out.
This is expected behavior. Once you add a status you cannot remove or delete it from the status set.
The system is designed this way to prevent any errors from happening if one chooses to delete the status if there are active candidates available in that particular status.
As it is not possible to uncheck or delete a status from this page you can only choose to disable the status in Status set.
Applicant Statuses, Greyed out, Edit Applicant Status Configuration , KBA , LOD-SF-RCM-APP , Applicants and Job Applications , How To