Updated from SAB 10.4 to 11.0.2. The feature to include a border around Scripture text still works, but the option not to display the border around book introductions no longer works. The border appears around the introductions for all the Bible books in the app.
This is an important feature in the context in which we work - to exclude the border around the book intros. I think this happened once before long ago, so hopefully it will be relatively easy to remedy.
Update: I reverted to SAB 11.0 and the borders now work correctly.