Hi Stephanie,
Alas, currently, the long anonymous guest IDs can't be changed, although that is something in our list of features for future development. One thing that can help when looking through transcripts is to sort the Activity tab by the Guest column, by clicking the column header. That way they sort sequentially and returning patrons with the same Guest ID are together.
The guest ID's are long like that to be in compliance with XMPP (Jabber chat) standards. In the end, chats start up very quickly because there is a minimum of negotiation with the XMPP server to start a conversation. This makes the chat very responsive for the patron.
Very best,
Pam
LibraryH3lp support