We sometimes have to turn off the copying and sharing of text for a second book collection because of the licensing. However, in iOS apps the text can still be copied and shared.
Related to this: when the two book collection texts are viewed in Two-Pane, the text in the top window also controls the available options in the bottom window. So if the top text can’t be shared, the options that should be available in the bottom window don’t show either. And vice versa, if the text with the enabled sharing options is in the top window, I can also create a verse-on-image with the lower text, although that should be excluded. This is a problem on Android as well!
There are 5 settings in the Sharing settings if all are off then I can’t do anything with the locked text. But if any are turned on then there are some options available.
So do you have all 5 options off for the locked text?