I agree the Ui is an important integrated part of the phone but it doesn't take away from what this phones achieves when using it.
A person can use a 3rd Party Launcher such as Nova Prime and a theme and icon pack to change the aesthetics if they do not like the look of the Samsung One Ui.
It did take a few days to get used to the new app icons and how things are displayed and shown.
Certain things I liked and used have been removed so to try and get those reintroduced or something similar introduced I've sent my feedback via the Samsung Members App / Samsung + App
The settings on my note 9 are differ then the first one I had why?
Well, bit more information please. You say that the settings are different than the first one. I assume that something happened and you got a replacement phone? Or are you using a newer/older model? If you got a replacement Note 9 are you using a newer/older Operating system? Did you change carriers? The carriers tweak and modify the OS before shipping it out to the users.