To this:
allowed = Orientation.LandscapeInverted
That did it and many thanks, meganerd, for weighing into this post.
One caveat to new Jolla folk--in nano, when deleting text, I found stray letters were left behind, at least on the screen. So I saved the file, reopened it, searched for the replaced text (ctrl-w), and found that it needed some retyping, even though I had deleted and typed correctly the first time.
Had I rebooted without checking the file, I think there would've been significant problems.
Thank you again, what a relief to stop craning my head,
Jake