@faizanzahid Those in the screenshot are the global privileges. You want to change the category privileges, selecting each category (see up to the right), at least the root ones. There is also a button to copy privileges to the children categories.
Yup. Check this out. It takes a hell of a lot of time to get used to but with some practice you'll find yourself writing 20 lines of html code in half a second, I'm totally serious.