MS Word Plugin, mouse over note, highlight/shading

I'm using the latest Zotero for Mac (5.0.73) together with the plugin for the latest version of MS Word for Mac (16.26) on both my desktop iMac and my MacBook air laptop. When I look at Zotero created footnotes and endnotes on my Mac, it has this neat feature that when I mouse over a note, the Zotero citation input (field) highlights/shades in gray so that you can clearly see what was added with Zotero and what wasn't.

For some reason, this same feature isn't activated on my MacBook Air laptop. Does anyone know how to activate it? I've looked through the preferences in both the Zotero app and the plugin in Word, but can't figure out how to turn it on.

Thanks in advance for any help anyone can offer!

— Greg
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