If you want to customize where your desktop items are located on your desktop, right-click any empty area on your desktop, which will bring up a menu that looks like the picture below. Click "view" to open the sub-menu.
In the sub-menu, if there is a check next to "Auto arrange icons", click "Auto arrange icons" to uncheck the setting. This will allow you to move the icons on your desktop to where you would like them to be but will keep them aligned to a grid position.
If there is not a check next to "Auto arrange icons", click "Auto arrange icons" to enable the setting. This will automatically arrange your desktop items in a grid format from left to right on your desktop.
If you do not want to align the icons to a grid format, uncheck the "Align icons to grid" option by clicking on "Align icons to grid".