can't find r.Streaming.PoolSize

I am trying to find **r.Streaming.PoolSize **so that I can change it. I have looked in files such as the console variables, MacEngine.ini and DefaultEngine.ini but can’t locate it. Has anyone encountered the issue of not being able to find the **r.Streaming.PoolSize? **

Managed to find **r.Streaming.PoolSize ** in the BaseScalability.ini file.