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 ...

If you want to duplicate desktop icons on multiple monitors on Windows 11/10, you can follow the below steps. Extend the displays in the Display settings Arrange the monitors in the order you want ...