I am confused.
I was under the impression that only those skills are active which you put onto the tree on the right side where the mutagens go too.
I just assigned a point into the Quen sign for that bubble burst. Need only a few xp to get another level and then I wanted to put it into the right-side tree to activate it.
So, from my understanding, it is not yet active.
Just fought a few drowners and when they destroyed my Quen shield, it exploded.
So, now I am unsure if that right-tree is maybe only to manage the mutagen bonuses and the skills you put points in are actually always active?
Edit: Everything I've found to this point tells me that only tree skills are active skills. Weird... maybe I got a wrong impression.