How can I modify the question number? What is "Question Reference"?

At the very top of your question editor, you'll notice your questions are numbered automatically in sequence, and this can't be changed. E.g. Q1, Q2, Q3, Q4, etc. But if you or your clients have an internal reference or customised question number that you always use for this question, e.g. the question below on Household Type might always be referred to internally as "HH1", then you can set that in the Question's Reference field at the very bottom of your question editor.

Question Reference in Question Editor

Question Reference in Response Exports

The Question Reference will appear at the end of your Question Title in the Response Exports