Greetings glynarcher,
Try the following:
1. Quit all applications.
2. Open a Finder window.
3. With the Finder window showing, click the “Go” menu and choose “Computer”.
4. Double-click “Macintosh HD”.
5. Open the “Library” folder.
6. Go into the “Application Support” folder.
7. Open the “Microsoft” folder.
8. Go into the “Office365” folder.
9. Navigate into the “User Content” folder.
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Open the “Startup” folder.
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Finally, open the “Word” folder here.
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If you see an “EndNote CWYW Word 2016.bundle” file inside of the Word folder, drag this file to the Trash.
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Launch Word 2016 and open any document to confirm the EndNote X7 tab is no longer appearing.
Please let me know if this helps.