You can use the following steps from our Knowledge Base:
https://support.clarivate.com/Endnote/s/article/EndNote-Using-Convert-to-Plain-Text-or-Remove-Field-Codes-removes-document-formatting?language=en_US
All changes that are manually typed in will be lost the next time EndNote updates the citations and bibliography to conform to the currently selected output style.
If you wish to edit an in-text citation do the following:
Right-Click on the item and choose “Edit Citation” from the popup menu. Alternatively, you can get to Edit Citation using the following method:
Word 2016/2013/2010/2007 with EndNote X4 and later: Go to the EndNote tab and choose “Edit & Manage Citation(s).”
Word 2016 Mac with EndNote X7 and later: Go to the EndNote tab and choose “Edit & Manage Citation(s).”
Word 2007 With EndNote X1 and later: Go to the EndNote tab and choose “Edit Citation(s).”
Word 2003/2004/2008/2011 with EndNote X4 and later: Go to the “Tools” Menu and choose “EndNote > Edit & Manage Citation(s).”
Word 2007 with EndNote X and earlier: Go to the Add-Ins tab and choose “EndNote > Edit Citation.”
Word X/2000/2002 (XP)/2003/2004/2008: Go to the “Tools” Menu and choose “EndNote > Edit Citation.”
Here you can enter a prefix, a suffix, or exclude the author or year. If you are entering a prefix or suffix, you’ll want to include any spaces or punctuation, as EndNote will display whatever is entered in these boxes. If you are trying to add page numbers, you’ll want to use the Suffix field in most cases. Click here for more information.
For footnoted citations (citations that are inserted into the footnote section in Word), the “Edit Citation” command can be used only to add page numbers. The prefix, suffix, exclude author, and exclude year options do not work for footnoted citations.
To edit how references are formatted in the bibliography, you must modify the output style you are using. For more information on modifying output styles, please refer to the chapter called “Bibliographic Styles” in the EndNote manual.
Remove EndNote Encoding:
If the kind of edits you need to make are not possible by using the “Edit Citations” command or modifying the output style, then you may want to remove the field codes. In doing so, the citations and the bibliography will become plain text that you can edit without problems. This step should be taken when you are done working with EndNote in the document, as removing the field codes removes the link between EndNote and Word, and adding or removing any citations after removing the field codes will not update your bibliography. Make a backup of the document to be safe, then do the following:
Word 2007 With EndNote X1 and later or Word 2013/2010/2013/2016 and EndNote X4 and later: Go to the EndNote tab and choose “Convert Citations and Bibliography > Convert to Plain Text.”
Word 2016 Mac with EndNote X7** and later **: Go to the EndNote tab and choose “Tools > Convert to Plain Text.”
Word 2007 with EndNote X and earlier: Go to the Add-Ins tab and choose “EndNote > Remove Field Codes.”
Word X/2000/2002 (XP)/2003/2004/2008/2011: Go to the “Tools” Menu and choose “EndNote > Convert to Plain Text or Remove Field Codes.”
Once this is done, your citations and bibliography will be regular text in Word, and you will be able to make any manual edits.