Unable to delete a SharePoint (not synchronized) on the File Explorer

Hello,

I have an old sync SharePoint folder on the left of my File Explorer.

I would like to delete it but I can't.

I get this error prompt when I click on it :

"is not available. If the location is on this PC, make sure the device or drive is connected or the disc is inserted, then try again. If the location is on a network, make sure you are connected to the network or the Internet, and then try again. If the location cannot be found, it may have been changed or deleted."

And I don't have a delete option when I right-click :

I created a folder named "SharePoint" in my C:\user\ folder so I can enter in but I still can not delete it. 

Do you know how I can delete it ?