Could someone walk me through setting up graphic settings?

I am using 4.5.1. I use UMG for all of my menus.
I was just wondering What I need to know to node in how to change lighting and other graphic settings.
I understand how to setup up what I need to in UMG or in blueprints…I just wasn\t sure what Node I need or anything to change these properties as I figure it’s withing the engine somewhere.

Any help would be great thanks!

You need an execute console command node + those commands: Scalability Reference for Unreal Engine | Unreal Engine 5.1 Documentation

EXACTLY what I needed thank you