No, one instance of Sentinel only.
The closest thing you can do, and it is a pain to do so, is figure out which .HPD file your Favorites List is in your c:users\yourname\documents\uniden\BCDx36HP folder. You can open this file using Notepad and look at its contents. You can have multiple instances of Notepad open to inspect several Favorites Lists at a time.
You should not make changes or Save the files in Notepad however. Might mess something up.