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There is no such setting in Showcase. I am not sure where you are getting that from? Showcase has never had such a setting.The thread-title will be generated automatically ... but where???
That's it!That same process also creates the 1st post of that thread, which is some simple text with a link to the Showcase Item (which also uses the title of the showcase item at the time of creation). You can change that text via the phrase xa_sc_item_thread_create