Again, it doesn't seem to relate to opening an image in Photoshop. I have Photoshop CC open. I go to File, Open, and select a folder. The icons are tiny. There doesn't seem to be an equivalent slider that osX has. Or a way to change the size of the icons.
Or, are you saying that Photoshop can't do it, and that I have to preview everything in a Mac finder window first, then go to Photoshop...???