To be able to enable a library or list as a catalog, you have to activate the Cross-Site Collection Publishing feature.
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Make sure that you’re a site collection administrator on the site collection that contains the library or list.
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On the top-level site of the site collection, from Settings
, select Site settings. -
On the Site Settings page, in the Site Collection Administration section, select Site collection features.
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On the Site Collection Features page, next to Cross-Site Collection Publishing, select Activate.
Notes:
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If you deactivate the Cross-Site Collection Publishing feature, this doesn’t remove the contents of a connected catalog from the publishing site. By deactivating this feature, you’ll no longer be able to modify existing catalog settings, or connect publishing sites to catalogs from the site collection.
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To remove contents of a connected catalog from a publishing site, you have to disconnect the publishing site from the catalog.