I'm playing the game with a controller, and have encountered an issue. Once I assign a skill to a action button (like A, for example), I cannot unassign it. I can replace it with other skill, but never remove it. So now I have the same skill assigned to 3 action buttons, with no way to remove the duplicates. I supposed that assigning the skill to the mapped button twice would remove it, but that did not work. I tried every button combination on the assign window, but nothing worked.
Is there a solution to this?