Sort multiple sources

Hi all
I've started using Zotero after a few months away and I'm now having difficulties with the ordering of authors in a citation. How do I get them listed in alphabetical order rather than whatever order I select them? I think there used to be a button for 'keep sources sorted', but this isn't showing now. I'm using a modified version of Harvard.

I've had a hunt on the forum but haven't found a clear answer - please point me in the right direction if I've missed it. Grateful for any help.

Thanks
Kate
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