There are 12 Screens in the pull-down list named “temp” thru “temp.011” which I have no idea how they got there. Each of them contains a User Preferences window which fills up the whole monitor. There is no header at the top of the window, so I can’t switch back to a different Screen. The only thing I can do is delete User Prefs which then closes Blender. Is there a way to remove the 12 Screens from the list?