The new site previews with custom code has killed my site.
Despite even rolling back to the most recent backup, I am now unable to see my site in Preview mode.
Your site is fine. The preview + custom code switch is “sticky”. You should still be able to see the switch at the bottom left, like this. Looks like your window is just too tall and it’s off screen.
If that’s not the case, you’d want to contact support- the community cannot assist with systems issues.
Note some code takes awhile to compile the first time. You may not be waiting long enough. Also, when you clicked back, you can see in the URL you’re just re-entering sitePreview mode. Click back again, or just go back to the dashboard and re-open it.