On Fri, 2 Mar 2018 22:13:27 +0000, Ian Jackson
wrote:

Maybe I'm misunderstanding things, but on my XP PC, this has absolutely
no effect on the size of the desktop icons. Any suggestions? [I never
knew there was supposed to be this facility.]

I don't have access to an XP PC to check this (I have a Win7
interface).

Right click on a blank area of the desktop.
Click "View". Do you get three options:
(Small icons, Medium icons, Large icons)?

That may be the only choice you have if you want to change the icon
size.