Export of notes, Folders or 'all' has vanished

Export of notes, Folders or 'all' has vanished

I want to export certain folders to html. This was easy: rightclick and then export.
Now this option is no more visible.

And the export of the complete database is gone.
I usually coud select it in the 'file' menu   (which is in my german installation  'Datei'

How can I regain this essential features?

Robert