I've done this once before, with LR5.7 on a 98-page Standard Portrait Softcover book, but I appear to have forgotten how as I can't select the spine text area of Standard Portrait Softcover 78-page book in LR6.6.
I have tried increasing the Preview to 4:1 but the cursor remains as the double-headed arrow.
I have tried changing the book to Hardcover dust jacket (then the spine is selectable) and adding my text before returning to Softcover, but the spine text disappears.
Is this a problem with LR6.6 or are 78 pages insufficient?
In my LR notes I have this reference, but do not know its origin (maybe a Blurb help page.)-
When creating soft-cover books using the Book module in Lightroom 5, you need to have a certain thickness to the book before you can add text to the spine. The limit differs based on the paper type:
-Premium Lustre paper – 84 pages
-Premium Matte paper – 84 pages
-ProLine Uncoated paper – 70 pages
-ProLine Pearl Photo paper – 70 pages
-Standard paper – 114 pages
For NON-softcover books (Hardcover Dust Jacket and Hardcover Image Wrap), you can have spine text even with a 1 page book. So you’ll always be able to input spine text on a hardcover book.