it is in apps but you have to turn on "show system apps".(see pictures below)
now you can't uninstall it or disable it,but you can choose to stop it running in background so it's not draining your battery.
I believe uwb application is used for connecting with other devices(a bit like Bluetooth).
I've stopped it running because it was using alot of battery and I have no use for it.
hope this helps
👍 
