The Show Desktop button on a typical Windows 10 Desktop is in an odd position. So much so, that many users may not know it is there. Drag your mouse all the way down to the very bottom right corner of the Taskbar—all the way to end (Figure A).
Figure A Figure A The button is just a thin sliver, and unless it is configured for it, hovering over the button may not be acknowledged by Windows 10 at all. Click the button and all of the currently open application windows will close to give you access to your Desktop. Click it again to re-open the application windows.