Add a Question to a Published Google Form Without Losing Responses

Open the existing Google Form in its editor.

Click on the 'Responses' tab.

Click on the 'Individual' tab.

Click on the 'Questions' tab.

Click on the 'Add question' button.

Open the question-type menu, currently labeled Multiple choice.

Click on the 'Short answer' option in the dropdown menu.

Type 'Team name' into the 'Question' field.

Click on the 'Copy responder link' button.

Click the 'Copy' button to copy the URL.

Go to "Demo Workshop Feedback — Add Question" (docs.google.com)

Type "DEMO-002" into the "Registration code *" input field.

Type 'Example Studio' into the 'Team name' input field.

Click the Submit button.

Go to "Demo Workshop Feedback — Add Question - Google Forms" (docs.google.com)

Click on the 'Responses' tab.

Click on the 'Individual' tab.

Click Next response to inspect response 2 of 2.

Click on the 'Previous response' button.

Done! This is the result.