It’s not common to change the visibility settings on a survey after it has closed; however, customers are still able to edit this by putting /share at the end of any closed survey and change survey access to “only people with the link”.
If Polco finds this to be a common trend among administrators, we can have our Product team add a button, so clients don’t have to do the /share trick.
If you would like to see this feature come to life, feel free to share your feedback in the Ideas tab! If it is already there, give it an upvote. We appreciate your input!