xfce 4.12 It was a freak mis-type of this combo (Was trying to go back using Alt-Left) but I realized after it was pressed, all windows closed not saving anything... I couldn't find anything online. There is nothing in my 'Keyboard->Application Shortcuts' list. How can I change this to not do this command again?
The keyboard shortcut Ctrl-Alt-Left move to the next workspace. Ctrl-Alt-Right move to the previous workspace and you can find here all your windows still open.
To change this setting, go to "Settings - Settings Editor - xfce4-keyboard-shortcuts". Or just set up only one workspace ...