I've already customized all the functions through the bottom navigation and left drawer. The top toolbar is kind of redundant and harder to reach, so would like to hide it.

If you're into Raspberry Pi 4B, why not weighing in on Orange Pi 5+ instead. For twice the price of Raspberry Pi 4B, we get thrice its power.

I am very satisfied which this board that I bought (2 units) about 2 months ago to add to my k8s Banana Pi M5 cluster. It's a relatively new board so expect to run into some problems as the software support is still in infancy. Not much complain as my k3s cluster is up and running. So far so good.