I just upgraded to 18.04 from 16.04. I am using
gnome-ubuntu-desktop. After upgrading the icon size on desktop are very large.
I am unable to find my option to decrease the size in preferences. How do I decrease it?
Grid view: Change your icon view from "list" to "grid" first by clicking the button next to the hamburger menu.
This should also reduce the size of the icons in your desktop.