Word plugin doesn't appear if Preview Pane is enabled in Windows File Explorer
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Just to back up a bit, I'll explain what I saw with my first installation. After experiencing the issue where the Zotero tab would disappear from Word, I could restore it by disabling the extension in Zotero desktop and reinstalling the extension. This allowed the Zotero tab to appear for one round of opening Word, even if I opened multiple Word docs, it was there. But after this first round, if I closed all Word documents and opened a new Word doc, the Zotero tab was gone.
I actually had a simliar issue with Mendeley's citation plugin. That is, if I opened an existing Word doc and lost the plugin, I could restore it by uninstalling/reinstalling from Mendeley Desktop (the older Mendeley Desktop, not the newer "Mendeley Reference Manager"). In attempting to uninstalling the plugin, I had to close both Word and File Explorer if my file was being shown in the preview pane. After removing/installing the pluigin and restarting both programs, the citation plugin would remain for the first round of opening, but then it would disappear if I closed Word. I switched to Zotero after this, so I can't comment further.
In trying to resolve the issue with the Zotero extension, I initially followed the Manual Installation Instructions I found the Word Startup folder was empty. As described in the Instructions, I tried to copy the Zotero.dotm file into the Word Startup folder but I received a warning from Windows "The destination already has a file named Zotero.dotm". I selected "replace" anyway, but it didn't resolve the disappearing tab.
I hope that all makes sense, but I can try to clarify if needed.
https://github.com/QL-Win/QuickLook
This plugin adds much more robust and usable preview features (ala macOS) and is lightweight (it’s also supported in Zotero via the Zotero QuickLook plugin).