Nice desktop customization, but seriously there is no point.
Customize your host desktop, as TheWormKill and v32itas have said, use a real distro like arch, and use kali in a VM.
If you have it in a VM you can get it to the state you want and take a snapshot, which you restore after every use.
Kali is good at what is does, which is have a shitload of pentesting tools that work out of the box, but it is an awful idea to use it as a main OS.
The packages are so outdated it's not even funny. And running outdated packages as root is just....