I want to revert this functionality because these yellow squares are too big and distracting.+ Configuration | Preview | Thumbnails | Show folder thumbnails: If a folder is not empty, but does not contain anything that can be used to generate a folder thumbnail, it will now display the yellow background square without an image, as opposed to empty folders, which only display the folder icon.
I would be okay if we could change the size of these squares, relative to the selected thumbnail size (e.g. 128 x 128)
Even though my thumbnail size is 128x128, the yellow square is 132x132 pixels, even bigger than my selected thumbnail size.
Would be better if it was 57% of selected thumbnail size. (e.g. 57% of 128x128 = 74x74 pixels, almost same size as original Windows folder icon.