How to count unique records in grouped view


Hi! We’re using Airtable as client & case management for our local diaper pantry. I’m trying to figure out how many unique clients we saw within a time frame. We can filter by date, then group by client code. For instance, right now that view shows that we had 95 visits in the time frame we’re searching. We can group by client code, then count how many groups - but there’s gotta be an easier way to figure out how many unique visits, right? I feel like I’m missing something super obvious but this is all still pretty new to me. Thanks in advance for any help!