How do I open PDFs externally?

Since Zotero 6, I've noticed that PDFs now open within the Zotero interface, with a context menu option to open them in a new (Zotero) window.

I want to view PDFs using the system default viewer (Chrome). How do I revert to this behaviour?
  • I've now found the Preference "Open PDFs using..." under Edit → Preferences, which works as advertised.
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