Icons8 and IconsScout are two free libraries ... Click “OK” on both windows after that, and the desktop icon should change. Repeat these steps for all the desktop icons.

Even though modern versions of Windows do not show them all on the desktop ... change your specific folder icons. You might want to also take a look at these Free software to change the Folder ...

You have a Windows 11/10 dual monitor setup running, and if you change from the primary display to the external monitor, you may notice that the Desktop icons have been moved to random positions.