I am new to joomla, so I try to develop a multilingual site. Everything seems to work fine except that I messed something and in my English home page the navigation menu is in a drop down menu while in the Greek one the links are side by side. Where do I have to dig in in order to restore one way or an other for both of my home pages? Thank you.
Ok, it seems that you have accidentally moved all the menu items under the "home" item as their parent. You can have a rough overview about the menu hierarchy in that menus dashboard.
If you need to be sure you can also just go into each menu items page and check for the "parent item" and make sure its "Menu item root" for all the items those you want side by side.