To delete an unformatted citation, highlight the entire citation (including delimiters), and press the Backspace or Delete key.
While it is possible to highlight a formatted citation and press the delete key on your keyboard, we do not recommend that you do that. If you do not completely delete the citation and all associated codes, you could corrupt your document.
To safely delete a formatted citation:
In Word, highlight the citation you want to delete.
From the Tools menu, go to the EndNote submenu, and then select Edit & Manage Citation(s). From the EndNote tab, select Edit & Manage Citations.
In the Edit & Manage Citations dialog, ensure that the citation you want to delete is highlighted. If the citation is part of a multiple citation, make sure you select just the citation you want to delete.
From the Edit Reference menu, click Remove Citation.
Click OK.