Data Retention Settings

With the new Data Retention settings introduced in 26.03, my assumption was that once enabled, it would clean up old logs and retain only those from the last X number of days. This does not appear to be the case, as I still have several million SIEM records dating back to the first day the system was deployed over two years ago. Is this an issue unique to my deployment? Is this a bug? Or is this by deign?

I was informed it cleans up 10,000 log entries/day by default. There is a way to increase this number, but it is not one mass dump of old logs as I’d imagined.