Icon Size Desktop Change. When that's done, follow these instructions. After that, take a look at the scale and layout option.
Follow the steps to increase or decrease icon size when you’re on your desktop: One more way how to change the size of desktop icons is directly from nautilus: Changing the appearance from display settings is a faster way to change size of desktop icon.
How to change desktop icon size?
You can also check the box next to a desktop icon's name at the top of the window to make it appear on your desktop, or uncheck the box to remove it from the desktop. Right click context menu on desktop. Changing the appearance from display settings is a faster way to change size of desktop icon. From the menu, select display settings.