Only applies to Live Conversion and Rating Notifications.
Live Conversion and Rating Notifications have further activities. Incase of Rating Notification activities are reviews and for Live Conversion activities are collected conversions.
Max Activities To Display is the total number of reviews/collected conversions to display in stream.
You want a stream with following notification types:
- Live Conversion
and you want to display only 1 notification per type. So you'll need to set Max Activities To Display to 1.