I'm having the same issue. Tried turning the printer on and off again, but the print jobs are still in the Cura Cloud with the first job wanting me to change to Black PLA instead of the Tough PLA that I have.
Update: I found that the vertical ellipse (3 dots) button used to delete was not available at first, but when I came back later, the button to delete was enabled. This button was available in the printer queue under the Monitor tab (desktop) and to the right of each print job record in both Cura and Cura Cloud online.