Resolved Many icons showing on desktop

Not sure how or why this happened, so hopefully someone can help me remedy the situation.
Today I went over to my mother's home to switch out her monitors. The main one she used would not have sound coming through the monitor speakers. Her 'spare' computer & monitor would play sound through the monitor, so I switched them out for her.
After doing so, the spare monitor works fine on her main computer (sound now works!) However after connecting the other monitor to her spare computer now has MANY icons now showing on her desktop!! I have no idea why/how this happened.

 

Thanks for the suggestion, Steve. I stopped over there today to see how that file option was checked. It was already set as what you had shown. I tried both checking & unchecking and neither made a difference, they always came back! I was able to create a new folder and moved them all into that. (was a little nervous at first because of all the icons already showing I was afraid I wouldn't find/see that folder!) So all's good--for now!

 

You can also right click on the taskbar and choose hide the desktop and they all hide. You can also unhide them the same way.