Optimizing Unreal 5.1.1

I’ve been struggling with the engine optimization and found this article:

In this article, it’s recommended to turn off nanite, lumen and shadow maps. But how do I turn them off?
Plus, I also found another article for optimization on reddit:
https://www.reddit.com/r/unrealengine/comments/nllvv9/psa_for_ue5_early_access_if_you_are_noticing_poor/

So, I turned temporal super resolution, but wanted to change the setting after a while. However, it’s completely gone. Although I search it from the project settings, it doesn’t show up ever again. How do I roll it back?