It can be useful to reset your menu back to the default settings - especially if you've disabled some items and can't find them.

To reset the menu to the default:

• go to: Settings & admin > site settings > menu settings
• click the "reset menu to default" button

If you have any custom menu items that you added, they will not be deleted - just moved to the very bottom of the list.  You can rearrange your menu items again after resetting the menu.