Problem :-

When you open eB Engineering Designer and you don't see the top menu options as shown in the below screen shot.

Explanation :-
To hide the top menu options you can right click to the right menu and select customize uncheck all the four options and close the top menu options will disappear.

Solution :-

1.  Close the eB engineering designer and login again it will bring back all the menu options.
2. You can also run the Query from Database to get back all the top menu options  
   DELETE from layout_data
   WHERE layout_name = ‘uicmMain’