In which application, as you talk about opening a file, it seems you mean something other than Finder?
Mac 101: Finder and the Desktop
"View" menu in Finder
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In finder when I open my photos or when I am uploading to a site and I need to select photos to upload. I did figure out how to put it into list mode.
Is there any way to make the thumbnails bigger when I open a file? Is there any way to get the same options (list, details, large, med, small) that I had on my pc?