Unable to select show thank you page after selecting redirect to external link

We are currently not experiencing any issues with the Thank You Page options in Card Forms. You can easily change from "Redirect to external link" to "Show a thank you page".

In the Form Builder, click the "Edit Thank You Page" button. After that, select the "Show a thank you page" option. Here's a screen capture:

If you are still having issues, I suggest you log out from JotForm and restart your browser. If the issue persists, then please try using another browser just to check if it will work or not. You may also need to clear your browser cache.

Hope that helps. Let us know if you have any questions. Thank you.