I tried the plasma notebook and kinda messing with it then suddenly all gone missing including the walpaper gone white and missing plasma toolbox. I don't know much about shortcut keys so I went with "CTRL+alt+F2" opened up the terminal and removed plasma netbook which also removes kde-plasma notebook using sudo command. After reboot I got this all black screen except for the pointer. My problem is in the system setting - workspace behaviour is still set to "netbook". I need to change that to "desktop" so I can get the screen back. Nevermind, I was able to get back to my deskop.
So now, my question would be how to restore everything to default in plasma notebook? Right now, I have deleted the "plasma-netbook-appletsrc" that's in ~/kde/share/config/.