How do I get rid of extra desktops in macOS?
Running High Sierra 10.13.3 on 2012 Mac Book Air with a Thunderbolt display and a Dell running through a USB to DVI converter. Going to Mission Control, moving the cursor to the top of the screen, there are 239 desktop icons labelled Desktop 1, Desktop 2, etc. The first two have the wallpaper I selected and the windows I have open; all the others do not - they only have the 10 desktop icons I have on Desktop 1, but not my wallpaper, and no windows that I have open. I'd like to delete the useless Desktops, but trying to hit the "X" at the top left of each icon is tricky (they move a lot) and time consuming (and likely will have to be repeated in future). Is there a way of eliminating the useless desktops efficiently?
MacBook Air (13-inch Mid 2012), macOS High Sierra (10.13.3), Thunderbolt display; Dell - USB/DVI