For modernized theme, mouseover of Index tab shows tooltip of Global Index, status bar shows url of /+index/. Mouseover of item index shows tooltip of List Subitems, status bar shows url of /+index/Home. But clicking either shows location line of "~/Global Index". foobar theme is similar but omits "~/" for Index tab.
The item index location line should probably say "~/Item Index" or similar. At least it should not say "~/Global Index".