Hey everyone. I recently started having this problem before updating to Big Sur and when I updated to Big Sur, I still had this same problem. However, I think I've discovered a solution that worked for me. For the record, I have a 2019 Macbook Pro 16" i9. Hopefully it can work for you too: If you have any external USB hubs that have a large number of ports or you have a large portion of devices running through your computer, try disconnecting or turning off a few ports. I have a hub that runs 10 USB ports (I'm a music producer and use a lot of midi devices lol). I just purchased the hub from amazon last week and that's exactly when I started having this issue with Finder. It also had a quick charging feature and I was running devices through that. Once I unplugged a cable, everything went back to normal (I.e.: my finder was able to open properly, my desktop icons came back, and I'm able to access my files). This may have been an issue very specific to me, but if everyone here is having the same problem that I had, maybe this can work for you. This is actually my very first time writing on a forum so I hope this helps!