Before exiting Arbil make sure that you have saved all your changes. This can easily be done by the key short-cut CTRL+S.

You can exit Arbil by closing the main window, or through File > Exit on Wi§ndows or Linux, or Arbil > Quit Arbil on Mac OS.

In case of unsaved changes a message will appear and ask if you wish to "Save changes before exiting"; choose "yes" or "no"; Arbil is now closed.