When I try to delete a space in Mission Control the usual way (pressing Option when the pointer is over a Space) nothing happens. So how are you supposed to kill a space with El Capitan?
how do you delete a space in Mission Control?
If you hover over the space without moving the cursor for about 2 seconds, does the close 'x' button appear like in OS X Yosemite?
Actually, what happened was that I was trying to close a space containing a full-screen app! After leaving full-screen, the space automatically disappeared. Bummer!