Doesn't really save battery like downgrading resolution though.There is a built-in method to make on-screen items smaller, go to settings, then tap Display, then adjust the View Mode. There are three settings, Small, Medium, and Large. The phone is set to Large by default, but I find Small perelfectlly suitable for daily use.
The op wasn't asking about battery savings, just seeing bigger iconsDoesn't really save battery like downgrading resolution though.