27" iMac desktop. I booted into safe mode to check something. When I returned my desktop has been reorganized. Something new to me is that it took documents and stacked them up by timeline. So I have some stuff stacked by 2020, 2021, 2022. OK, I can undo all that but I want stuff back where I had it on the desktop and I'd rather not spend the time manually doing it. And because I don't know what caused this to happen I can't figure out how to undo it. I don't want it to keep happening to me. I looked under settings desktop and appearance but nothing jumped out at me. What is the secret?