I was modifying the header of the View Responses part (In fact I deleted the header) when suddenly I saw that all my questions in the design part had disappeared.
Only my questions, not the horizontal lines or whatever, just my questions.
How can I recover them ? Is there a History section in the Design part?
>> Is there a History section in the Design part?
Sorry, there is no History section in the Design part. However, while you are editing and as long as you have not closed the document, you can always use Edit/Undo or Redo in the Design or the View Responses part.