Bibliography won't list all authors despite having checked 'list all author names'

Help!  I have a thesis due soon and I can’t get the bibliography to list all authors.  I have checked the ‘list all authors’ box in the output style manager but  when I update the bibliography nothing changes!  I have tried multiple styles and it won’t change.  

Does anyone have any suggestions?  Thanks!

Assuming that listing all authors is appropriate per the style guidelines for your discipline.

Are you using the correct output style file? After modifying the Author Lists section of your EndNote output style to “List all authors” (see attached image) the modification is saved to a new Endnote output style file. The new Endnote output style file has the word “Copy” added to the file name so you would need to change the setting in MS Word to use the new output style file to have the bibliography updated to list all authors.

Thankyou for your reply Leanne!  Sorry if this is obvious but how do I change the output style in the document?  I only know how to do it in Endnote

Thanks for the reply, I have selected the ‘copy’ version in Endnote but I’m not sure how to select an output style in Word.  Sorry if this is an obvious question!

I finally got it!  Thankyou for your help, it was because the Endnote toolbar wasn’t displaying in Word so I couldn’t change the output style in th document