gone after upgrade to 6.603, that’s a serious regression.
actually, worse than gone, some navigation seems to be happening but does not have visual feedback in the UI: Enter, for instance, opens random links from mails that are neither selected nor being read. Changelog links from wiki give 404. (I would have tried to relate this regression to changes, chose a version to downgrade to)
oh, I found the internal changelog in the app, something is something, in a browser, it would be searchable, copyable…