Mojave's new “Use Stacks” command lets you organize the items on your desktop with a single menu selection (choose View-->Use Stacks) or keyboard shortcut (press Command + Control + 0). 

They say a picture is worth a thousand words; here’s how it works:

It's that simple. 

If your Desktop is a mess, burn that keyboard shortcut — Command + Control + 0 — into your muscle memory and start using it to turn your Desktop clutter into neatly organized stacks. 

One last thing: If you're concerned about Stacks messing up your desktop icons, which you've so carefully arranged, you'll be happy to know that pressing Command + Control + 0 again will return your Desktop to its former arrangement no matter how disorganized or messy.

😜