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I have looked everywhere for some way to display them and can't find anything.
It seems you accidentally have hit the shortcut for 'show only thumbnails' (on a Mac that is Cmd + T). Go to the menu view and there will be a check mark in front of the 'Show only thumbnails'. Click on it to uncheck the command or use the shortcut that shows next to the line.
You are certainly not the first one to make this mistake and also will not be the last one