Where the heck do I set that 
On category icon component, of course. Damn I’m in slow mode today.
But now you said that I have a weak memory print I didn’t use colors because then category nav bar was too reckless. And ’cos about 95 % of my users are typical end user with mobiles, no one uses sidebar. So this isn’t any bigger thing in my circles.
But good to know, thanks!