In SAP Fieldglass, Profile Worker End Dates can be set at the company level as either optional or defined.

Optional End Date
Optional End Date for Profile Workers is the default setting. This configuration means that if enabled, a user can leave the End Date field blank when creating a Profile Worker and the record is considered valid indefinitely until manually updated. However, it is considered good practice to set an End Date to maintain data accuracy and efficiently manage your external workforce, transactional or not.
Defined End Date
In this alternate setting, users can specify an End Date when creating the Profile Worker to set a defined validity period. Once the End Date is reached, the Profile Worker record might be flagged as needing review or requiring an update, dependent upon alert and management configurations established by the buyer.