Does the button appear if you try using safe mode? If so it’s a theme or plugin changing the behavior… you may have to try disabling your themes and plugins 1-by-1 to determine the cause (if you share a link here we can also take a look).
Does the button appear if you try using safe mode? If so it’s a theme or plugin changing the behavior… you may have to try disabling your themes and plugins 1-by-1 to determine the cause (if you share a link here we can also take a look).