Just found this in HISTORY.txt:
- Public preview mode now has a back button to go back to the
Silva UI. Note that in order for this to work, you have to
update layout templates, or at least, preview_html in the
Silva root (change 'preview' in it to 'public_preview').
This important item shouldn't be only buried in HISTORY.txt, but needs to be
loudly and clearly communicated to users in The Release Communiqué. I changed
the text, since updating the layout templates won't change the existing