New
#21
The theory is that there is a bug introduced in Creators Update for handling the arrangement of icons on the desktop. It seems to be triggered (for me, at least) when trying to place an icon on the bottom row. Instead it gets placed at the top and all the other icons jump around to accommodate it. By making the vertical spacing fractionally smaller the bottom row is just a little higher up so there's a bit more free space below the bottom row. This seem to prevent the bug being triggered.
This theory is supported by Jim L's...
...which is another way of increasing the available space beneath the bottom row.