Apple has released Safari 15.1 for macOS Big Sur and macOS Catalina. The Safari update brings the features of Safari 15 to users on older macOS versions. It also reintroduces the existing tab bar design that was available prior to the Safari 15 release.

source https://gadgets.ndtv.com/apps/news/apple-safari-15-1-macos-big-sur-catalina-release-update-download-2590779#rss-gadgets-all