Question: Adjusting finder icon
For my Finder folders I manually change the Finder icon to images of my chosing.
Recently, the Finder icon automatically reshapes the icon in a square, which makes the image out of proportion since the original image is rectangular.
Does anyone why this happens and how do I ensure the Finder icon will be in the shape as I copy the image?
MacBook Air, macOS High Sierra (10.13.3)