Seeing a dotted square white border (Universal Focus Rectangle) around desktop icons is not a big thing. But if this occurs often & annoys you, see this post.

Make custom Windows 11 desktop icons with our easy to follow step by step guide When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

If you don't disable it manually, most will add a new desktop icon by default. After a few years of this, you'll find that your desktop has become a cluttered catastrophe of icons, usually not ...

The new icons are from Shell32.dll and include items such as the hibernation icon and the floppy disk icon. The icons in Windows 10 build 20H2 are pixelated beauties from decades ago.