I just got a new workstation, a new M1 Mac Mini with the most current MacOS, Bug Sur. On my previous workstation, I could search for a type of file on my network and Finder would present a field of all of the files that matched with preview thumbnails of the file. This is instrumental for my job, to be able to find a file visually out of hundreds of the same file type. On my new workstation, I am only presented with icons of the applications in which they were saved. Luckily, I was able to retain my previous workstation, so I can visually search using that set-up, but I sure would like to be able to do that on my new one.
I need this...
Could this be an Apple OS issue or an Adobe issue? I don't know. I'm just trying to do what I need to.
I don't use a Mac but it looks like your radically new M1 with Big Sur doesn't support thumbnail previews. Honestly, it doesn't surprise me given all the problems Apple has been having lately. That said, try using Adobe Bridge instead of Mac Finder.