How to change the default open mode of PDF in zotero?

After Zotero was updated to 6.0, the built-in PDF reader became the default way to open PDF documents, which brought me a lot of trouble, because I was used to using external PDF reading tools. After the update, I couldn't easily open PDF files through external tools to view the contents I previously marked.

So can I change the default opening mode of PDF in Zotero? If not, can this function be added later?
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