Change Visual Effect Settings in Windows 10.Restore File Explorer options to default.Methods to fix image thumbnails not showing Here we bring the various methods to try in Windows 10 and fix the ‘picture thumbnails not showing’ issue. However, Windows allows you to troubleshoot the problem. It is also possible that your photos are corrupt due to which thumbnails are not visible in the folder. Other than these, if thumbnail cache files get corrupt, then too, you won’t be able to preview pictures in File Explorer folders. Windows File Explorer settings to show thumbnails can get disabled and show image file icons without picture preview. Wrong thumbnails or no thumbnails could be a Windows OS bug or file systems error caused due to corruption in files or drive. Figure: Photo thumbnails not showing in Windows 10