Beginning from version 3.0, Screen Calendar allows you to organize your desktop icons variously.

The "Enable Screen Calendar Icons arrangement" option must be active to arrange the desktop icons.

Please select “Number on desktop” for your icons in vertical and horizontal rows. This number haven’t to be less than the real number of icons.
You can see preview of the icons arrangement when you choose:

Left Top Right Bottom

Left & Right Top & Bottom Spiral CW Spiral CCW

For quick arrangement: use the "Arrange icons" item in the systray menu to choose one of the arrangement types of icons on your desktop.
The icons arrangement by this method runs always and not depends on the "Enable Screen Calendar Icons arrangement" option.

Set check/uncheck "Show icons on Desktop" in the systray menu to show or hide icons.