The 'Purge Server Object Caches' setting is exposed in Strategy Developer 10.x and is accessed as follows:

The 'Purge Server Object Caches' setting purges the server-side object cache for configuration objects. Configuration objects are essentially server-level objects such as users, schedules, schedule requests etc.
NOTE: There are two types of server-side object caches - one for schema and application objects and the other for configuration objects. The former are project-level objects while the latter are server-level objects. Refer to the following Strategy Knowledge Base technical note for additional details concerning these two types of object caches:
KB14815 (KB5300-8X-0849) - What are the different settings governing server-side object cache usage in Strategy Intelligence Server