The upper limit to the number of references you can have in any one EndNote library will depend on the version of EndNote you have. Please see this article:
https://support.clarivate.com/Endnote/s/article/EndNote-Upper-size-limits-on-a-library-file
The upper limit to the number of references you can have in any one EndNote library will depend on the version of EndNote you have. Please see this article:
https://support.clarivate.com/Endnote/s/article/EndNote-Upper-size-limits-on-a-library-file