I've seen numerous threads about this since Windows 10 dropped, and two years on I still can't find a solution.
In W10 all the folder images which display on the preview either stretch or show a horrible white border (if the dimensions are equal). Apparently this was one of the idiotic 'improvements' Microsoft made, which meant if you had a collection of Music with corresponding artwork in the folder, that artwork image (folder.jpg), would go from filling up the folder in the preview, to having a big white border around the image.
I think the link below will help understand what I mean more:
https://answers.microsoft.com/en-us/win ... 21d64d32ecI used Classic Shell on Windows 8.1, brilliant program, but can Classic Shell fix this annoyance from Windows 10?
Thanks