In the confirmation box, click on Delete files to permanently delete the files. Make sure you select the box with the option Thumbnails under Files to Delete section and click on Ok. Select the C: drive to clean up from the drop-down menu and click OK.Īfter the scanning is complete, select the files you want to delete. Using the Disk Cleanup tool is one way of fixing the black background problem behind the folder icon by deleting all the Thumbnail files on your disk. 1] Use Disk Cleanup to remove Thumbnail files In this article, we explain some solutions on how to fix the black background problem behind the folder icons in Windows 10. The graphical flaws can also occur if users are using an outdated graphics driver. The cause of this visual glitch problem can be, corrupted system files or outdated thumbnail caches. While the black squares behind the folder icons look unsightly, the problem, however, is not a major issue and it is just a graphical glitch that will not cause any damage to the content of folders and files. Even refreshing the File Explorer multiple times is of no help and the black square appears to be a perpetual issue. However, while setting up the different styles for the file and folder icons, some of the Windows users have come across the weird problem of black squares showing up behind the folder icons.

One may opt to display the file picture in large size thumbnails or may prefer to set the icons of files and folders in a small or medium size list. The Windows users can use some efficient styles to view the contents of the file system as per the user’s requirement. Windows File Explorer provides a variety of ways to organize the contents of files and folders of the system.

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