It is not possible to show the response ID while the respondent is answering the survey. However, we can show it on thank you page that the respondent gets after finishing the survey. We can use tag ${response_id} to display the response ID.
Steps: Go to the Finish Option >> Select Thank you page >> Use the above tag or use the insert variable option to add the tag. Screenshot: https://prnt.sc/Speo6LO3jW9P
Helpfile: https://www.questionpro.com/help/thank-you-page.html