"Use this command to terminate the application." - MWSnap help contents
Exit, is one of the function used in MWSnap. It is located on the rightmost side of the button.
The usage of the function is same as closing the window without hiding to the system tray.
This is one of the function that does not have a hotkey, although it can be closed completely (without hiding to system tray) with Alt+F4 with default windows hotkey.
This button can also be accessed by click on the File tab, then the Exit button, which the picture is the same.