Having the same issue. It seems like even if a dialog box wasn't given upon placing from CC library to InDesign, there'd be a toggle to select which artboard to show at some point. I love CC libraries, and really need this. Having multiple files for sign backgrounds is a waste of time - we're forced to choose either CC Libraries or AI files with multiple artboards and working old school.
Having the same issue. It seems like even if a dialog box wasn't given upon placing from CC library to InDesign, there'd be a toggle to select which artboard to show at some point. I love CC libraries, and really need this. Having multiple files for sign backgrounds is a waste of time - we're forced to choose either CC Libraries or AI files with multiple artboards and working old school.