Oh man! 😔 I couldn't recreate this issue. It was an issue in a very early version but that was long before it came to posting this listing. You're definitely meant to be able to exit and retry. Originally you used the escape key to do this, but web browser security means you can only hide the cursor on a click - so that option was removed and the "x" is now a button.
Could be a browser issue, could be a platform issue. Will keep hunting. If anyone else experiences this issue please post with browser version and platform. I'm on Chrome 101 (Mac OS X), Safari 15.1 (Mac OS X) and Edge 101 (Windows 11). Could also be a small screen resolution issue if the content overlapped on full screen.