That clears a lot. Thanks!
But I still don't understand why this option is there, and why it cannot be replaced by "more basic" setting... This really could be an option, not default setting.
Charts look more complex now. Maybe too complex! I can't know with quick look how much is received and how much transmitted, because they are in same color and sometimes both bars connect to each other, to one big brown bar. At least it looks like that! (fex. between 4th and 5th december chart is not very readable...).
Of course with deeper look I'm able to see the values. But for people who are not so familiar with network monitoring, this can be "too much"... For example high level managers who make decisions for network bandwidth solitions.