I use online version of EndNote, with cite while you write on Microsoft Word.
Currently trying to reference in APA 6th edition, but when I put a paper in for the first time it immediately shortens all extra authors to _et al. _How could I change it so the first time a reference is used all authors are listed, and then et al after this?
I don’t know that there is an online accessible output style that will do this automatically. If you use Endnote Online thru an institution, they may have an administrator who can add other output styles with modified requirements. For a user to achieve this, you would need to be using the desktop version, I think.