The alignment of the top level menu items within the menu bar.  Please note that the menu item alignment will only have an effect if the menu bar is wider than the menu items.  <br/><strong>Automatic</strong> will align left/right based on the current language direction LTR/RTL.  <br/><strong>Flex (Justify)</strong> will use Flexbox styling to evenly distribute any extra space in the menu bar evenly over the items.