Long time customer's can have long histories to sort through. If you're looking for a specific item within their history, you can narrow your search using special filters like Membership activity to save time.
To do this, locate a customer using Customer List > open their profile > click Activity > History > Filters.
Use the membership (or another) filter > click Apply filter.
The list will now be narrowed down to just activity by memberships. Use the dropdown carrots to see a detailed view of each memberships activity.