Thanks Michael. I have an Applications > EagleFiler Data folder with files like a decent-zied me.library (updated today), so clearly that’s where my files are.
Looking at your links for prefs/etc, at /Users//Library/Application Support/EagleFiler/ I have a number of empty folders (Stationery, Capture Receipts, App Store Receipts) and the only two files are Aliases to my me.eflibrary located in the StartUp Items folder and Open Libraries folder (both inside /Application Support/EagleFiler).
I assume that moving those would be useless because the alias links would break, right?
Also, in /Users//Library/Preferences/ I have two .plist files:
com.c-command.EagleFiler.eftexttool (last modified in 2016!) and
com.c-command.EagleFiler (modified today)
I assume I only need to copy the latter, yes?