There are many comments in this TidBITS-TALK page. One comment was ... absolutely hate having the Favorites Bookmarks under the tabs. Is there any way to revert to the old arrangement? BTW Ira, it appears that the tab color options preference is intact in Big Sur, judging by the comments and screenshot.

Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365