Message Retention: I want to Keeping Old Messages, but mistakenly clicked the "Delete Old Messages" in Storage, and now that option disappeared.

My iCloud is full, so I was looking to delete a few things and stay within my 2TB. When I was in Storage, it offered a "Delete Messages older than 1 year automatically" and i must have touched that by mistake. It would not let me reverse that choice, then that option disappered.

I love having my old messages and want to keep them!