Is possible see in Ad list group management the number of domains has every list? And how many duplicates? For me is important to clear ad list that have only a little number of domains not duplicates.
You have this information when updates.
Wait you can understand I said. Sorry for my bad English.
In Pi-hole V5 and later, duplicates among the various adlists are not removed. This keeps each adlist intact, so you can apply adlists to individual management groups.
I am not entirely sure I fully understand your intention, but if you would be looking for insights into your actual adlist utilisation (e.g. to help you decide whether to keep an adlist or not), I think a third-party utility like yubiuser's adlist tool would be able to provide those.