Retention Policy - Using it to prevent deletion instead of automatically prune

I’m not sure where the best place for this is, and I removed the placeholder version number fields because I have several RC deployments of several versions, from version 3 to “current”.

Anyway, I’m wondering if there’s some setting I’m missing with global retention policies, essentially, I’m trying to force messages to be retained until they’re pruned, is there some way to do this on “any version” of RC?

I know I can set auto prune at 365 days or whatever, and things will be pruned once they’re a year old, but what I’m looking for is the ability to make things not able to be deleted (preferably by anyone, ever, including administrators) until they are at least one year old.