I guess I’ve never come across the need to customize this yet, surprisingly!
I’m looking in both /application/view/omeka/site and the existing theme. Unlike /items, there is no show.phtml, even in the application views.
It almost appears as though when you select a particular item set, it is using /item/show.phtml. Is there code inside that theme file that differentiates between whether it is viewing an item or item set? And that’s where I would customize the item set view, while leaving the item view alone?
Or, is it possible to simply copy the item/show.phtml into item-set/ directory and then Omeka-S will start using that file instead of /item/show?