This option lets you remove smudges or any mark around the edges of a document. You can remove an equal area around all four sides of the paper, or you can pick a particular edge. Edge Erase also removes whatever is within the area selected, leaving nothing on that portion of the scan.
If a Lexmark printer has been exposed to a compromised or breached network (malware, virus, ransomware, etc.), this article shows you what you must do.