Why does Safari doesn't show tabs in Sequoia 15.4.1?

Exactly the same here. Mendeley extension causes mainframe flashing, and now first some tabs are not showing. Please fix thoses.

I have had the same issue with the tabs’ headers disappearing and only showing when you click on their location. I went on Safari-settings-tabs to check if “always show website titles in tabs” was selected and it was. When I unselected it, all the tab headers re-appeared, and still show, which is the opposite of what is advised 🤔

Same here, Safari just showing blank space where it used to show all the tabs site logos and page names. Extremely annoying.

I also quitted Safari by using “Force quit applications” and restarted Safari with the shift key pressed

Thank you. Same issue and your fix with its reverse logic appears to be working for me.