"Keep sources sorted" button not working

Hello,

The "Keep sources sorted" option isn't appearing when I click the "Z" button in the add citation dialog box.The only option that appears is "classic view" (screenshot attached).

Any idea why this might be the case?I'm using Chicago 17th author-date.This is an issue, as the order of the citations appears to be random.

Thanks,
Tom
188BET靠谱吗https://s3.amazonaws.com/zotero.org/images/forums/u12885226/mwgc6jdupxul4wy58rwn.png
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