The “combine” button in the stash is gone, what did I do to make that happen and how do I undo it. 
Partial components are no longer a thing, thus the combine button is no longer needed.
So 2 piles of the same materials I have to combine manually? And I had the button in my inventory untill like a week ago…
You have to combine them manually only once after the patch after that everything’s working just as before.
Tanks for the replys.