What do you mean, “remove”? Do you want them full, or different? I assume you are still citing them?
– are you using the desktop version? You can edit the short form for each ref type in the output style to be what ever you prefer for the second time cites. But also check the settings for "repeated citations in the footnote templates, as that is where it gives options for using short form or other types of special handling.
Remember to save as to a new name and use the newly named output style in your word endnote ribbon. You can modify settings and “save” after you have renamed, and change to the new name output style, then update citations/bibliography to see if it has the preferred output and continue to tweak it, save again, etc.