This "evaluation copy" text is a built-in indicator. According to Microsoft Tech Community contributors, it cannot be permanently removed without switching to a stable, retail version of Windows.

I am currently running in a test environment. I have a couple of questions regarding the "Evaluation Copy" watermark and licensing.

Unlike a standard retail or volume license version, this build is explicitly designated as an evaluation copy , meaning it carries functional and legal restrictions intended for testing and validation in non-production environments.

: A permanent "Evaluation copy" watermark appears in the bottom-right corner of the desktop, displaying the specific OS build number.