|Reduce the display screen using the button in top right corner immediately to left of the red X . If the image still covers most/all of the desktop you can re-size by hovering mouse over a corner until you see diagonal double-ended arrow icon. then left-click and drag image smaller.|
Once you have the image small enough you can then drag your desired item out of the folder to the desktop.
I often have two reduced size explorer windows open to make easy use of drag-n-drop.
Goin' Fishin' (Some day)