OPLog Configuration missing on atlas

Hello guys,

I have a cluster with these configs

image911×276 24.8 KB

I want to set the same config in another project for the Set Maximum Oplog Size
But there is no option for that!

image931×312 28.1 KB

Both of them are running Mongo v6 on M30 tier
How do I change the Set Maximum Oplog Size when this option doesn’t show?

Thank you!