I am using Ubuntu 18.04 but Title bar which used to show File Edit etc is not appearing like it used to show in unity.
Many applications move towards eliminating the classical menu. Files, the standard file manager of the Gnome Desktop in Ubuntu 18.04, is among these apps. You will find the options under various buttons in the top bar. Application wide menus are found in the drop down menu in the top bar. You open that menu by clicking on the application name in the top bar. (This appmenu will disappear in the near future in future Gnome versions)]1.