thanks @ariehen I missed those release notes. Your screenshot was helpful, because the icon was hidden for me on my laptop, needed to slide the pane a bit.
As a general principle - breaking, time diverting changes should be avoided. The change to Bookmarks could have been much kinder. Lots of people like my wife who is not that computer savvy was completely flummoxed as all her stuff disappeared. No really a good reason to change the name from starred, or to break existing sidebars and so on so far as I can see.