Excel for Mac now has multi-threaded calculation, as of the release of version 16.9 on 18-Jan-2018. To update, go to Help > Check for updates. Thanks for all of your comments and support for this feature.
As mentioned in earlier comments, if you encounter any issues, please send the details to us by clicking the smiley-face button in the top right corner of the Excel window.
Thanks – Steve K [MS Excel]
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