This key binding for the “close all” command will work with Sublime Text 3. You’ll be able to close all open files by using the shortcut: Ctrl + Alt + w.
In Sublime Text, go to Preferences -> Key Bindings -> Default. Paste this on a new line, right above the last closing square bracket:
{ "keys": ["ctrl+alt+w"], "command": "close_all" },
Questions and Comments are Welcome