Thanks for your inputs.
The problem was my large hand. I grab the knob just with 4fingers. To difficult even more, there is a power socket zipped to the electric wire just on top. I think that power socket is to charge the battery. Unzipped it and it becames easier.
With the bike on centre stand, rotate conterclockwise to zero, then turn it clockwise trying to feel the clicks. Not sure, but each half turn is a click. Adjusted it to 30 clicks (factory setting is 7 and max is 35). The static sag, is, now, 46mm and rider sag 87mm, so raised the rear 13mm from previous setting. Still need to reduce rider sag to 65,4mm. Not even in the full preload will achieve that.
In the forks increased also the preload to keep close the level (and trail).
As I won't do serious offroad, and run 90/10 tyres, this preload settink will be enough for now. I will try to learn how to use damping settings.