To stop an active or live survey, go to survey builder page. Click on share tab, upon scrolling down you may choose the survey link from email, social or weblink that you want to pause. Choose the active link that you want to pause, click on pause to pause the live survey or if you want to delete the link you can do it by clicking on the delete icon.
Note: you cannot delete a survey link, if it has got any response.
Please refer to the example below: