New Posts Self-pruning NOT wanted.

[محروم.كوم]

PHP version
vB 3.8.1 (will be upgrading soon)
Do not have any "New Posts" mods installed or "search" mods.

I'm not sure if this has been a feature on vB for quite a few versions or its something "newish", but I've been really busy lately and not been able to keep up with all the "new posts" on my site and have noticed this.......

It seems that any thread/post that is older than 10 days is being self-pruned off of my "New Posts" list.

Looking high and low and can't find an option to turn this on/off or adjust the quantity of days.

Probably just blind and its there, but can someone guide me to it. I felt like I knew vB backwards and forwards, but I can't seem to find the option to correct this issue of mine.

RESTATE: How do I make my "New Posts" not self-prune from their list when they exceed an age of 10 days?

Thanks for any help. __DEFINE_LIKE_SHARE__