Ebook Central Turnaway alert at book level
Allow Turnaway alerts to be disabled in the Full Record View for individual titles (e.g., in Edit Book Level Permissions area). If a title is no longer available for sale on the platform and the library has made other arrangements to provide access, the Turnaway alerts are no longer used.

Thank you for your feedback on this potential enhancement. We are currently reviewing this request, and gathering additional information. In the meantime, please continue to provide more feedback and we welcome your votes! We will keep the status updated of the project update here.
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Nathaniel Pockras commented
As long as you'd have to choose to opt out, as described here, or if you could toggle a single setting to disable them all at once: I've benefited from turnaway alerts for no-longer-sold books, e.g. finding another book on the same topic, and I wouldn't want to lose them. It would be nice if ProQuest could make these alerts optional for people who don't want them, but disabling them altogether would hurt me, and it would be an inordinate amount of work if I had to re-enable alerts for all no-longer-sold books one at a time.