To arrange the desktop sticky notes by a specify sort order or layout, right-click on the Notezilla icon and choose Desktop notes->Arrange Notes menu item.
To change the layout of the sticky notes inside a memoboard, right-click on the background of the notes view, and choose 'Arrange notes' menu item. You can also select the appropriate layout or sort option.
You will also find the 'Arrange Notes' button inside the top toolbar of the Notes Browser.