You might notice that some icons on Windows 10 have two blue arrows on them. These arrows are not part of the standard icon for any file or folder. The two blue arrows indicate that the file or folder in question has been compressed to save disk space. This is a Windows feature and it doesn’t have any negative impact on the file or folder it’s applied to however, if it bothers you, you can disable compression and remove the two blue arrows from an icon.
The compression doesn’t have to be removed for all files and folders. You can disable compression for select files and folders.