The “Open in New Tab” feature now opens a full screen chat preview instead of a direct link into the sandbox. This was a recent change for security reasons as too many people have had their accounts compromised by sharing the preview URL with its access token, despite the banner saying not to do that
As a hack for power users, you can get the original URL back by copying the preview iframe src, but you must keep that secure
To get a private URL you can share with other people, first enable git sync
Then it’ll unlock the publish preview option
