Stacks are a nice feature of the new os. But couple of things. I noticed pics and pdfs for example stack together nicely. Right on top of each other. Like a deck of cards when delt. But folders don't stack. They only arrange in some order ( not sure ). But folders don't stack. The line up one after the other in a row top to bottom. But they do not stack. Also if I say use stacks they auto line up to the right of my screen and stay there (2014 Mac mini 2.6 8gb ram). I cannot move them anywhere else. Like keep some on the right r some on the left. Or just drag them to any spot on the screen. Stacks are nice but the whole point is to organize them how I want. Not just random order on the right side of my screen. I need to be able to move them. Maybe in future updates.